----

| [X]                                                                                                                                                                                                                                                                        | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------|
| For the quarterly period ended June 30, 2011                                                                                                                                                                                                                               |
|                                                                                                                                                                                                                                                                       |
| or                                                                                                                                                                                                                                                                         |
|                                                                                                                                                                                                                                                                       |                                                                                     |
| [  ]                                                                                                                                                                                                                                                             | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
| For the transition period from                                       to |

| Arizona                                                                                       | 86-0649974                          |
|-----------------------------------------------------------------------------------------------|-------------------------------------|
| (State or other jurisdiction ofincorporation or organization)                                 | (I.R.S. EmployerIdentification No.) |
|                                                                                          |                                |
| 5601 West Buckeye RoadPhoenix, Arizona85043(Address of Principal Executive Offices)(Zip Code) |
|                                                                                          |                                |
| Registrant's telephone number, including area code:                                           | 602-269-2000                        |

| Large accelerated filer x | Accelerated filer o         |
|---------------------------|-----------------------------|
| Non-accelerated filer o   | Smaller reporting company o |

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TABLE OF CONTENTS

|                                 | Page Number                                                                                                     |
|--------------------------------------|-----------------------------------------------------------------------------------------------------------------|
| PART I – FINANCIAL INFORMATION |                                                                                                            |
|                                 |                                                                                                            |
| Item 1.                              | Financial Statements                                                                                            |   |
|                                 |                                                                                                            |   |
|                                 | Condensed Consolidated Unaudited Balance Sheets as of June 30, 2011 and December 31, 2010                       | 1 |
|                                 |                                                                                                            |   |
|                                 | Condensed Consolidated Unaudited Statements of Income for the three and six months ended June 30, 2011 and 2010 | 3 |
|                                 |                                                                                                            |   |
|                                 | Condensed Consolidated Unaudited Statements of Cash Flows for the six months ended June 30, 2011 and 2010       | 4 |
|                                 |                                                                                                            |   |
|                                 | Notes to Condensed Consolidated Unaudited Financial Statements                                                  | 6 |
|                                 |                                                                                                            |   |
| Item 2.                              | Management's Discussion and Analysis of Financial Condition and Results of Operations                           | 15 |
|                                 |                                                                                                            |   |
| Item 3.                              | Quantitative and Qualitative Disclosures About Market Risk                                                      | 24 |
|                                 |                                                                                                            |   |
| Item 4.                              | Controls and Procedures                                                                                         | 24 |
|                                 |                                                                                                            |   |
| Part II – OTHER INFORMATION    |                                                                                                            |
|                                 |                                                                                                            |   |
| Item 1.                              | Legal Proceedings                                                                                               | 25 |
|                                 |                                                                                                            |   |
| Item 1A.                             | Risk Factors                                                                                                    | 25 |
|                                 |                                                                                                            |   |
| Item 2.                              | Unregistered Sales of Equity Securities and Use of Proceeds                                                     | 26 |
|                                 |                                                                                                            |   |
| Item 3.                              | Defaults Upon Senior Securities                                                                                 | 26 |
|                                 |                                                                                                            |   |
| Item 4.                              | Removed and Reserved                                                                                            | 26 |
|                                 |                                                                                                            |   |
| Item 5.                              | Other Information                                                                                               | 26 |
|                                 |                                                                                                            |   |
| Item 6.                              | Exhibits                                                                                                        | 27 |
|                                 |                                                                                                            |   |
| Signatures                           |                                                                                                            | 28 |

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| KNIGHT TRANSPORTATION, INC. AND SUBSIDIARIESCondensed Consolidated Unaudited Balance Sheetsas of June 30, 2011 and December 31, 2010(in thousands) |   |
|----------------------------------------------------------------------------------------------------------------------------------------------------|--------|
|                                                                                                                                               |   |
|                                                                                                                                               |   | June 30,2011 |   |   | December 31,2010 |   |
| ASSETS                                                                                                                                             |   |   |   |   |   |   |
| Current Assets:                                                                                                                                    |   |   |   |   |   |   |
| Cash and cash equivalents                                                                                                                          |   | $ | 15,672 |   |   | $ | 28,013 |   |
| Short-term investments held for trading                                                                                                            |   |   | - |   |   |   | 24,379 |   |
| Accounts receivable, net of allowance for doubtful accounts                                                                                        |   |   | 95,408 |   |   |   | 78,479 |   |
| Notes receivable, net of allowance for doubtful accounts                                                                                           |   |   | 1,345 |   |   |   | 1,391 |   |
| Related party notes and interest receivable                                                                                                        |   |   | 3,037 |   |   |   | 3,038 |   |
| Prepaid expenses                                                                                                                                   |   |   | 8,627 |   |   |   | 8,514 |   |
| Assets held for sale                                                                                                                               |   |   | 3,217 |   |   |   | 4,132 |   |
| Other current assets                                                                                                                               |   |   | 7,464 |   |   |   | 4,717 |   |
| Income tax receivable                                                                                                                              |   |   | - |   |   |   | 6,914 |   |
| Current deferred tax asset                                                                                                                         |   |   | 4,434 |   |   |   | 5,671 |   |
| Total current assets                                                                                                                               |   |   | 139,204 |   |   |   | 165,248 |   |
|                                                                                                                                               |   |   |   |   |   |   |   |   |
| Property and Equipment:                                                                                                                            |   |   |   |   |   |   |   |   |
| Revenue equipment                                                                                                                                  |   |   | 599,148 |   |   |   | 584,237 |   |
| Land and land improvements                                                                                                                         |   |   | 33,942 |   |   |   | 31,906 |   |
|  Buildings and improvements                                                                                                                   |   |   | 79,625 |   |   |   | 77,949 |   |
| Furniture and fixtures                                                                                                                             |   |   | 10,515 |   |   |   | 8,112 |   |
| Shop and service equipment                                                                                                                         |   |   | 6,870 |   |   |   | 6,511 |   |
| Leasehold improvements                                                                                                                             |   |   | 2,722 |   |   |   | 2,512 |   |
| Gross Property and Equipment                                                                                                                       |   |   | 732,822 |   |   |   | 711,227 |   |
| Less:  accumulated depreciation and amortization                                                                                         |   |   | (245,439 | ) |   |   | (227,518 | ) |
| Property and equipment, net                                                                                                                        |   |   | 487,383 |   |   |   | 483,709 |   |
| Notes receivable – long-term                                                                                                                 |   |   | 4,126 |   |   |   | 4,246 |   |
| Goodwill                                                                                                                                           |   |   | 10,304 |   |   |   | 10,313 |   |
| Intangible assets, net                                                                                                                             |   |   | 21 |   |   |   | 52 |   |
| Other long-term assets and restricted cash                                                                                                         |   |   | 13,772 |   |   |   | 13,419 |   |
| Total assets                                                                                                                                       |   | $ | 654,810 |   |   | $ | 676,987 |   |

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| KNIGHT TRANSPORTATION, INC. AND SUBSIDIARIESCondensed Consolidated Unaudited Balance Sheets (continued)as of June 30, 2011 and December 31, 2010(in thousands, except share data) |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|
|                                                                                                                                                                              |   |   |   |   |   |   |
|                                                                                                                                                                              |   | June 30,2011 |   |   | December 31,2010 |   |
| LIABILITIES AND SHAREHOLDERS' EQUITY                                                                                                                                              |   |   |   |   |   |   |
| Current Liabilities:                                                                                                                                                              |   |   |   |   |   |   |
| Accounts payable                                                                                                                                                                  |   | $ | 14,424 |   |   | $ | 7,571 |   |
| Accrued payroll and purchased transportation                                                                                                                                      |   |   | 10,212 |   |   |   | 6,547 |   |
| Accrued liabilities                                                                                                                                                               |   |   | 14,604 |   |   |   | 11,075 |   |
| Claims accrual – current portion                                                                                                                                            |   |   | 13,614 |   |   |   | 13,843 |   |
| Dividend payable – current portion                                                                                                                                          |   |   | 73 |   |   |   | 1,433 |   |
| Total current liabilities                                                                                                                                                         |   |   | 52,927 |   |   |   | 40,469 |   |
|                                                                                                                                                                              |   |   |   |   |   |   |   |   |
| Long-term Liabilities:                                                                                                                                                            |   |   |   |   |   |   |   |   |
| Claims accrual – long-term portion                                                                                                                                          |   |   | 10,189 |   |   |   | 10,168 |   |
| Dividend payable – long-term portion                                                                                                                                        |   |   | 1,383 |   |   |   | - |   |
| Deferred tax liabilities                                                                                                                                                          |   |   | 123,113 |   |   |   | 118,886 |   |
| Total long-term liabilities                                                                                                                                                       |   |   | 134,685 |   |   |   | 129,054 |   |
|                                                                                                                                                                              |   |   |   |   |   |   |   |   |
| Total liabilities                                                                                                                                                                 |   |   | 187,612 |   |   |   | 169,523 |   |
|                                                                                                                                                                              |   |   |   |   |   |   |   |   |
| Commitments and Contingencies                                                                                                                                                     |   |   |   |   |   |   |   |   |
|                                                                                                                                                                              |   |   |   |   |   |   |   |   |
| Shareholders' Equity:                                                                                                                                                             |   |   |   |   |   |   |   |   |
| Preferred stock, $0.01 par value; 50,000 shares authorized; none issued and outstanding                                                                                           |   |   | - |   |   |   | - |   |
| Common stock, $0.01 par value; 300,000 shares authorized; 80,448 and 83,693 shares issued and outstanding at June 30, 2011 and December 31, 2010, respectively                    |   |   | 804 |   |   |   | 837 |   |
| Additional paid-in capital                                                                                                                                                        |   |   | 130,498 |   |   |   | 126,975 |   |
| Accumulated other comprehensive income                                                                                                                                            |   |   | (361 | ) |   |   | 7 |   |
| Retained earnings                                                                                                                                                                 |   |   | 336,209 |   |   |   | 379,714 |   |
| Total Knight Transportation shareholders' equity                                                                                                                                  |   |   | 467,150 |   |   |   | 507,533 |   |
| Noncontrolling interest                                                                                                                                                           |   |   | 48 |   |   |   | (69 | ) |
| Total shareholders' equity                                                                                                                                                        |   |   | 467,198 |   |   |   | 507,464 |   |
|                                                                                                                                                                              |   |   |   |   |   |   |   |   |
| Total liabilities and shareholders' equity                                                                                                                                        |   | $ | 654,810 |   |   | $ | 676,987 |   |

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| KNIGHT TRANSPORTATION, INC. AND SUBSIDIARIESCondensed Consolidated Unaudited Statements of Income(In thousands, except per share data) |   |
|----------------------------------------------------------------------------------------------------------------------------------------|--------|
|                                                                                                                                   |   |
|                                                                                                                                   |   | Three Months EndedJune 30, |   |   | Six Months EndedJune 30, |   |
|                                                                                                                                   |   | 2011 |   |   | 2010 |   |   | 2011 |   |   | 2010 |   |
| REVENUE:                                                                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenue, before fuel surcharge                                                                                                         |   | $ | 182,350 |   |   | $ | 155,290 |   |   | $ | 332,850 |   |   | $ | 295,605 |   |
| Fuel surcharge                                                                                                                         |   |   | 46,133 |   |   |   | 30,118 |   |   |   | 82,107 |   |   |   | 55,493 |   |
| Total revenue                                                                                                                          |   |   | 228,483 |   |   |   | 185,408 |   |   |   | 414,957 |   |   |   | 351,098 |   |
| OPERATING EXPENSES:                                                                                                                    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Salaries, wages and benefits                                                                                                           |   |   | 55,856 |   |   |   | 52,381 |   |   |   | 106,791 |   |   |   | 100,164 |   |
| Fuel expense                                                                                                                           |   |   | 60,079 |   |   |   | 43,975 |   |   |   | 109,778 |   |   |   | 84,210 |   |
| Operations and maintenance                                                                                                             |   |   | 14,859 |   |   |   | 11,554 |   |   |   | 26,588 |   |   |   | 22,601 |   |
| Insurance and claims                                                                                                                   |   |   | 8,794 |   |   |   | 6,582 |   |   |   | 15,015 |   |   |   | 12,341 |   |
| Operating taxes and licenses                                                                                                           |   |   | 3,893 |   |   |   | 3,567 |   |   |   | 7,605 |   |   |   | 6,618 |   |
| Communications                                                                                                                         |   |   | 1,396 |   |   |   | 1,386 |   |   |   | 2,721 |   |   |   | 2,712 |   |
| Depreciation and amortization                                                                                                          |   |   | 18,351 |   |   |   | 17,965 |   |   |   | 36,825 |   |   |   | 35,931 |   |
| Purchased transportation                                                                                                               |   |   | 34,801 |   |   |   | 19,018 |   |   |   | 60,240 |   |   |   | 35,804 |   |
| Miscellaneous operating expenses                                                                                                       |   |   | 3,320 |   |   |   | 2,984 |   |   |   | 6,313 |   |   |   | 6,142 |   |
| Total operating expenses                                                                                                               |   |   | 201,349 |   |   |   | 159,412 |   |   |   | 371,876 |   |   |   | 306,523 |   |
|                                                                                                                                   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Income from operations                                                                                                                 |   |   | 27,134 |   |   |   | 25,996 |   |   |   | 43,081 |   |   |   | 44,575 |   |
|                                                                                                                                   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest income                                                                                                                        |   |   | 462 |   |   |   | 504 |   |   |   | 807 |   |   |   | 939 |   |
| Other income/(expense)                                                                                                                 |   |   | - |   |   |   | (154 | ) |   |   | 8 |   |   |   | 663 |   |
| Income before income taxes                                                                                                             |   |   | 27,596 |   |   |   | 26,346 |   |   |   | 43,896 |   |   |   | 46,177 |   |
|                                                                                                                                   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Income taxes                                                                                                                           |   |   | 11,120 |   |   |   | 10,538 |   |   |   | 17,565 |   |   |   | 18,025 |   |
| Net income                                                                                                                             |   |   | 16,476 |   |   |   | 15,808 |   |   |   | 26,331 |   |   |   | 28,152 |   |
|                                                                                                                                   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net (income)/loss attributable to noncontrolling interest                                                                              |   |   | (118 | ) |   |   | 28 |   |   |   | (117 | ) |   |   | 28 |   |
| Net income attributable to Knight Transportation                                                                                       |   | $ | 16,358 |   |   | $ | 15,836 |   |   | $ | 26,214 |   |   | $ | 28,180 |   |
|                                                                                                                                   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Earnings per common share and common share equivalent:                                                                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Basic                                                                                                                                  |   | $ | 0.20 |   |   | $ | 0.19 |   |   | $ | 0.31 |   |   | $ | 0.34 |   |
| Diluted                                                                                                                                |   | $ | 0.20 |   |   | $ | 0.19 |   |   | $ | 0.31 |   |   | $ | 0.33 |   |
|                                                                                                                                   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Weighted average number of common shares and common share equivalents outstanding:                                                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Basic                                                                                                                                  |   |   | 82,785 |   |   |   | 83,499 |   |   |   | 83,275 |   |   |   | 83,427 |   |
| Diluted                                                                                                                                |   |   | 83,307 |   |   |   | 84,418 |   |   |   | 83,882 |   |   |   | 84,272 |   |

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| KNIGHT TRANSPORTATION, INC. AND SUBSIDIARIESCondensed Consolidated Unaudited Statements of Cash Flows(in thousands) |   |
|---------------------------------------------------------------------------------------------------------------------|--------|
|                                                                                                                |   | Six Months EndedJune 30, |   |
|                                                                                                                |   | 2011 |   |   | 2010 |   |
| Cash Flows From Operating Activities:                                                                               |   |   |   |   |   |   |
|                                                                                                                |   |   |   |   |   |   |
| Net income                                                                                                          |   | $ | 26,331 |   |   | $ | 28,152 |   |
| Adjustments to reconcile net income to net cash provided by operating activities:                                   |   |   |   |   |   |   |   |   |
| Depreciation and amortization                                                                                       |   |   | 36,825 |   |   |   | 35,931 |   |
| Gain on sale of equipment                                                                                           |   |   | (2,610 | ) |   |   | (1,807 | ) |
| Earnout on sold investment                                                                                          |   |   | - |   |   |   | (718 | ) |
| Gain from insurance claim settlement                                                                                |   |   | - |   |   |   | (100 | ) |
| Gain from TRP I earnout                                                                                             |   |   | (13 | ) |   |   | - |   |
| Loss from investment in Transportation Resource Partners III                                                        |   |   | 6 |   |   |   | 151 |   |
| Non-cash compensation expense for issuance of stock to certain members of board of directors                        |   |   | 112 |   |   |   | 112 |   |
| Provision for doubtful accounts and notes receivable                                                                |   |   | 282 |   |   |   | 1,053 |   |
| Excess tax benefits related to stock-based compensation                                                             |   |   | (117 | ) |   |   | (291 | ) |
| Stock-based compensation expense                                                                                    |   |   | 2,058 |   |   |   | 2,087 |   |
| Deferred income taxes                                                                                               |   |   | 5,688 |   |   |   | (5,089 | ) |
| Changes in operating assets and liabilities:                                                                        |   |   |   |   |   |   |   |   |
| Short-term investments held for trading                                                                             |   |   | 24,379 |   |   |   | (25,701 | ) |
| Trade receivables                                                                                                   |   |   | (16,903 | ) |   |   | (7,742 | ) |
| Related party interest receivable                                                                                   |   |   | (49 | ) |   |   | 88 |   |
| Other current assets                                                                                                |   |   | (2,747 | ) |   |   | (386 | ) |
| Prepaid expenses                                                                                                    |   |   | (113 | ) |   |   | (1,329 | ) |
| Income tax receivable                                                                                               |   |   | 6,914 |   |   |   | - |   |
| Other long-term assets                                                                                              |   |   | (13 | ) |   |   | (92 | ) |
| Accounts payable                                                                                                    |   |   | 3,213 |   |   |   | (1,645 | ) |
| Accrued liabilities and claims accrual                                                                              |   |   | 6,612 |   |   |   | 8,394 |   |
|                                                                                                                |   |   |   |   |   |   |   |   |
| Net cash provided by operating activities                                                                           |   |   | 89,855 |   |   |   | 31,068 |   |
|                                                                                                                |   |   |   |   |   |   |   |   |
| Cash Flow Used in Investing Activities:                                                                             |   |   |   |   |   |   |   |   |
|                                                                                                                |   |   |   |   |   |   |   |   |
| Purchase of property and equipment                                                                                  |   |   | (46,783 | ) |   |   | (61,548 | ) |
| Proceeds from sales of equipment                                                                                    |   |   | 12,909 |   |   |   | 16,227 |   |
| Proceeds from insurance claim settlement                                                                            |   |   | - |   |   |   | 100 |   |
| Cash collection from notes receivable                                                                               |   |   | 1,687 |   |   |   | 1,610 |   |
| Cash issued for notes receivable                                                                                    |   |   | (1,258 | ) |   |   | (640 | ) |
| Cash proceeds from related party notes receivable                                                                   |   |   | 50 |   |   |   | 92 |   |
| Increase in restricted cash                                                                                         |   |   | (641 | ) |   |   | (50 | ) |
| Cash received from Concentrek earnout                                                                               |   |   | - |   |   |   | 718 |   |
| Cash received from TRP I earnout                                                                                    |   |   | 13 |   |   |   | - |   |
| Investments in Transportation Resource Partners I & III                                                         |   |   | (288 | ) |   |   | (159 | ) |
|       Return of investment in Transportation Resource Partners                        |   |   | - |   |   |   | 63 |   |
|                                                                                                                |   |   |   |   |   |   |   |   |
| Net cash used in investing activities                                                                               |   |   | (34,311 | ) |   |   | (43,587 | ) |

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| KNIGHT TRANSPORTATION, INC. AND SUBSIDIARIESCondensed Consolidated Unaudited Statements of Cash Flows (continued)(in thousands) |   |
|---------------------------------------------------------------------------------------------------------------------------------|--------|
|                                                                                                                            |   |   |   |
|                                                                                                                            |   | Six Months EndedJune 30, |   |
|                                                                                                                            |   | 2011 |   |   | 2010 |   |
| Cash Flow Used in Financing Activities:                                                                                         |   |   |   |   |   |   |
|                                                                                                                            |   |   |   |   |   |   |
| Dividends paid                                                                                                                  |   | $ | (10,018 | ) |   | $ | (9,180 | ) |
| Purchase of company stock on open market                                                                                        |   |   | (59,200 | ) |   |   | - |   |
| Excess tax benefits related to stock-based compensation                                                                         |   |   | 117 |   |   |   | 291 |   |
| Cash investment from noncontrolling interest holder                                                                             |   |   | - |   |   |   | 24 |   |
| Proceeds from exercise of stock options                                                                                         |   |   | 1,216 |   |   |   | 3,010 |   |
| Net cash used in financing activities                                                                                           |   |   | (67,885 | ) |   |   | (5,855 | ) |
|                                                                                                                            |   |   |   |   |   |   |   |   |
| Net decrease in cash and cash equivalents                                                                                       |   |   | (12,341 | ) |   |   | (18,374 | ) |
| Cash and cash equivalents, beginning of period                                                                                  |   |   | 28,013 |   |   |   | 30,812 |   |
|                                                                                                                            |   |   |   |   |   |   |   |   |
| Cash and cash equivalents, end of period                                                                                        |   | $ | 15,672 |   |   | $ | 12,438 |   |
|                                                                                                                            |   |   |   |   |   |   |   |   |
| Supplemental Disclosures:                                                                                                       |   |   |   |   |   |   |   |   |
| Non-cash investing and financing transactions:                                                                                  |   |   |   |   |   |   |   |   |
| Equipment acquired with accounts payable                                                                                        |   | $ | 4,002 |   |   | $ | 617 |   |
| Transfer from property and equipment to assets held for sale                                                                    |   | $ | 4,065 |   |   | $ | 9,084 |   |
| Financing provided to independent contractors for equipment sold                                                                |   | $ | 1,863 |   |   | $ | 1,721 |   |
| Dividend accrued for restricted stock units                                                                                     |   | $ | 137 |   |   | $ | 153 |   |
| Cash Flow Information:                                                                                                          |   |   |   |   |   |   |   |   |
| Income taxes paid                                                                                                               |   | $ | 2,045 |   |   | $ | 23,550 |   |

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KNIGHT TRANSPORTATION, INC. AND SUBSIDIARIES

|                                                                      |   | Three Months EndedJune 30, |   |   | Six Months EndedJune 30, |   |
|---------------------------------------------------------------------------|--------|----------------------------|--------|--------|--------------------------|--------|
|                                                                      |   | (in thousands)             |   |   | (in thousands)           |   |
|                                                                      |   | 2011                       |   |   | 2010                     |   |   | 2011 |   |   | 2010 |   |
| Stock compensation expense for options,  net of forfeitures     |   | $                          | 616    |   |                     | $      | 893 |   |   | $ | 1,315 |   |   | $ | 1,663 |   |
| Stock compensation expense for restricted stock units, net of forfeitures |   |                       | 367    |   |                     |   | 211 |   |   |   | 743 |   |   |   | 424 |   |
| Combined stock compensation expense                                       |   |                       | 983    |   |                     |   | 1,104 |   |   |   | 2,058 |   |   |   | 2,087 |   |
| Income tax                                                                |   |                       | (398   | )      |                     |   | (442 | ) |   |   | (823 | ) |   |   | (815 | ) |
| Net stock compensation expense after tax                                  |   | $                          | 585    |   |                     | $      | 662 |   |   | $ | 1,235 |   |   | $ | 1,272 |   |

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| ·   | Dividend yield – the dividend yield is based on our historical experience and future expectation of dividend payouts. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------|

| ·   | Expected volatility – we analyzed the volatility of our stock using historical data for the past 7 years through the end of the most recent period to estimate the expected volatility. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Risk-free interest rate – the risk-free interest rate assumption is based on U.S. Treasury securities at a constant maturity with a maturity period that most closely resembles the expected term of the stock option award. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Expected terms – the expected terms of employee stock options represents the weighted-average period the stock options are expected to remain outstanding and has been determined based on an analysis of historical exercise behavior for the past 7 years through the end of the most recent period. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                                |   | Option Totals |      |   | Weighted Average ExercisePrice Per Share |   |
|-------------------------------------|--------|---------------|-----------|--------|------------------------------------------|--------|
| Outstanding as of December 31, 2010 |   |          | 4,144,476 |   |                                     | $      | 15.68 |   |
| Granted                             |   |          | -         |   |                                     |   | - |   |
| Exercised                           |   |          | (98,137   | )      |                                     |   | 12.29 |   |
| Forfeited                           |   |          | (77,908   | )      |                                     |   | 16.56 |   |
| Outstanding as of June 30, 2011     |   |          | 3,968,431 |   |                                     | $      | 15.71 |   |

|                             |   | Number of Restricted Stock Unit Awards |      |   | Weighted Average Grant Date Fair Value |   |
|----------------------------------|--------|----------------------------------------|-----------|--------|----------------------------------------|--------|
| Unvested as of December 31, 2010 |   |                                   | 1,364,560 |   |                                   | $      | 16.11 |   |
| Granted                          |   |                                   | -         |   |                                   |   | - |   |
| Vested                           |   |                                   | (81,513   | )      |                                   |   | 16.11 |   |
| Forfeited                        |   |                                   | (14,460   | )      |                                   |   | 16.24 |   |
| Outstanding as of June 30, 2011  |   |                                   | 1,268,587 |   |                                   | $      | 16.11 |   |

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|                                                                 |   | Three Months EndedJune 30,                  |   |   | Six Months EndedJune 30, |   |
|----------------------------------------------------------------------|--------|---------------------------------------------|--------|--------|--------------------------|--------|
|                                                                 |   | 2011                                        |   |   | 2010                     |   |   | 2011 |   |   | 2010 |   |
|                                                                 |   |  (in thousands, except per share data) |   |
| Weighted average common shares outstanding – basic             |   |                                        | 82,785 |   |                     |   | 83,499 |   |   |   | 83,275 |   |   |   | 83,427 |   |
| Dilutive effect of stock options and unvested restricted stock units |   |                                        | 522    |   |                     |   | 919 |   |   |   | 607 |   |   |   | 845 |   |
| Weighted average common shares outstanding – diluted           |   |                                        | 83,307 |   |                     |   | 84,418 |   |   |   | 83,882 |   |   |   | 84,272 |   |
|                                                                 |   |                                        |   |   |                     |   |   |   |   |   |   |   |   |   |   |   |
| Net income attributable to Knight Transportation                     |   | $                                           | 16,358 |   |                     | $      | 15,836 |   |   | $ | 26,214 |   |   | $ | 28,180 |   |
| Earnings per common share                                            |   |                                        |   |   |                     |   |   |   |   |   |   |   |   |   |   |   |
| Basic                                                                |   | $                                           | 0.20   |   |                     | $      | 0.19 |   |   | $ | 0.31 |   |   | $ | 0.34 |   |
| Diluted                                                              |   | $                                           | 0.20   |   |                     | $      | 0.19 |   |   | $ | 0.31 |   |   | $ | 0.33 |   |

|                           |   | Three Months EndedJune 30, |      |   | Six Months EndedJune 30, |   |
|--------------------------------|--------|----------------------------|-----------|--------|--------------------------|--------|
|                           |   | 2011                       |      |   | 2010                     |   |   | 2011 |   |   | 2010 |   |
| Number of anti-dilutive shares |   |                       | 2,412,556 |   |                     |   | 7,500 |   |   |   | 2,088,856 |   |   |   | 7,500 |   |

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| Goodwill:                                    |   | In Thousands |   |
|----------------------------------------------|--------|--------------|--------|
| Balance at December 31, 2010                 |   | $            | 10,313 |   |
| Amortization relating to deferred tax assets |   |         | (9     | ) |
| Balance at June 30, 2011                     |   | $            | 10,304 |   |

| Intangible Assets:           |   | In Thousands |   |
|------------------------------|--------|--------------|--------|
| Balance at December 31, 2010 |   | $            | 52     |   |
| Amortization                 |   |         | (31    | ) |
| Balance at June 30, 2011     |   | $            | 21     |   |

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|                                                   |   | Three Months EndedJune 30, |   |   | Six Months EndedJune 30, |   |
|--------------------------------------------------------|--------|----------------------------|--------|--------|--------------------------|--------|
|                                                   |   | 2011                       |   |   | 2010                     |   |   | 2011 |   |   | 2010 |   |
|                                                   |   |  (in thousands)       |   |
| Net income attributable to Knight Transportation       |   | $                          | 16,358 |   |                     | $      | 15,836 |   |   | $ | 26,214 |   |   | $ | 28,180 |   |
| Other comprehensive income:                            |   |                       |   |   |                     |   |   |   |   |   |   |   |   |   |   |   |
| Net unrealized loss from available-for-sale securities |   |                       | (621   | )      |                     |   | - |   |   |   | (361 | ) |   |   | - |   |
| Total comprehensive income                             |   | $                          | 15,737 |   |                     | $      | 15,836 |   |   | $ | 25,853 |   |   | $ | 28,180 |   |

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|                                                               |   |                    |   |                        |   | Level One               |   | Level Two                   |   | Level Three             |
|--------------------------------------------------------------------|--------|-------------------------|--------|-----------------------------|--------|-------------------------|--------|-----------------------------|--------|-------------------------|
|                                                               |   | Balance atJune 30, 2011 |   | Balance atDecember 31, 2010 |   | Balance atJune 30, 2011 |   | Balance atDecember 31, 2010 |   | Balance atJune 30, 2011 |   | Balance atDecember 31, 2010 |   | Balance atJune 30, 2011 |   | Balance atDecember 31, 2010 |
|                                                               |   | (in thousands)          |
| Assets:                                                            |   |                    |   |                        |   |                    |   |                        |   |                    |   |   |   |   |   |   |
| Money market funds                                                 |   | $11,320                 |   | $22,856                     |   | $11,320                 |   | $22,856                     |   | -                       |   | - |   | - |   | - |
| Trading Securities:                                                |   |                    |   |                        |   |                    |   |                        |   |                    |   |   |   |   |   |   |
| Debt securities - municipal securities                             |   | -                       |   | $24,379                     |   | -                       |   | -                           |   | -                       |   | $24,379 |   | - |   | - |
| Available-for-sale Securities:                                     |   |                    |   |                        |   |                    |   |                        |   |                    |   |   |   |   |   |   |
| Equity securities - common shares                                  |   | $4,331                  |   | $4,923                      |   | $4,331                  |   | $4,923                      |   | -                       |   | - |   | - |   | - |
| Restricted cash and investments:                                   |   |                    |   |                        |   |                    |   |                        |   |                    |   |   |   |   |
| Money market funds and debt securities –municipal securities |   | $3,520                  |   | $2,879                      |   | $817                    |   | $811                        |   | $2,703                  |   | $2,068 |   | - |   | - |

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|                                          |   | June 30,2011   |   |   | December 31, 2010 |   |
|-----------------------------------------------|--------|----------------|--------|--------|-------------------|--------|
|                                          |   | (in thousands) |   |
| Notes receivable from independent contractors |   | $              | 2,156  |   |              | $      | 2,391 |   |
| Notes receivable from third parties           |   |           | 3,652  |   |              |   | 3,598 |   |
| Net investment in sales-type leases           |   |           | 95     |   |              |   | 128 |   |
| Gross notes receivable                        |   |           | 5,903  |   |              |   | 6,117 |   |
| Allowance for doubtful notes receivable       |   |           | (432   | )      |              |   | (480 | ) |
| Total notes receivable net of allowance       |   |           | 5,471  |   |              |   | 5,637 |   |
|                                          |   |           |   |   |              |   |   |   |
| Current portion (net of allowance)            |   |           | 1,345  |   |              |   | 1,391 |   |
| Long-term portion                             |   | $              | 4,126  |   |              | $      | 4,246 |   |

|                                        |   | June 30,2011   |   |   | December 31, 2010 |   |
|---------------------------------------------|--------|----------------|--------|--------|-------------------|--------|
|                                        |   | (in thousands) |   |
| Total minimum lease payments to be received |   | $              | 103    |   |              | $      | 140 |   |
| Less: unearned income                       |   |           | (8     | )      |              |   | (12 | ) |
| Net investment in sales-type leases         |   | $              | 95     |   |              | $      | 128 |   |

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| ● | Revenue, before fuel surcharge, increased 17.4%, to $182.4 million from $155.3 million;                      |
|---------|--------------------------------------------------------------------------------------------------------------|
|    |                                                                                                         |
| ● | Net income attributable to Knight increased 3.3%, to $16.4 million from $15.8 million; and                   |
|    |                                                                                                         |
| ● | Net income attributable to Knight per diluted share increased 4.7%, to $0.20 per share from $0.19 per share. |

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|                                                                   |   | (A)(Fuel surcharge included in revenue)Three-Month Period EndedJune 30, |   |   | (B)(Fuel surcharge excluded from revenue and netted to fuel expense) Three-Month Period EndedJune 30, |   |   | (C)(Fuel surcharge included in revenue)Six-Month Period EndedJune 30, |   |   | (D) (Fuel surcharge excluded from revenue and netted to fuel expense)Six-Month Period EndedJune 30, |
|------------------------------------------------------------------------|--------|-------------------------------------------------------------------------|--------|--------|-------------------------------------------------------------------------------------------------------|--------|--------|-----------------------------------------------------------------------|--------|--------|---------------------------------------------------------------------------------------------------------------|
|                                                                   |   |                                                                    |   |   |                                                                                                  |   |   |                                                                  |   |   |                                                                                                          |   |   |   |   |   |   |   |   |   |   |   |
|                                                                   |   | 2011                                                                    |   |   | 2010                                                                                                  |   |   | 2011                                                                  |   |   | 2010                                                                                                          |   |   | 2011 |   |   | 2010 |   |   | 2011 |   | 2010 |
|                                                                   |   |                                                                    |   |   |                                                                                                  |   |   |                                                                  |   |   |                                                                                                          |   |   |   |   |   |   |   |   |   |   |   |
| Revenue                                                                |   |                                                                    | 100.0  | %      |                                                                                                  |   | 100.0  | %                                                                     |   |   | 100.0                                                                                                         | % |   |   | 100.0 | % |   |   | 100.0 | % |   |   | 100.0 | % |   |   | 100.0 | % |   | 100.0 | % |
|                                                                   |   |                                                                    |   |   |                                                                                                  |   |   |                                                                  |   |   |                                                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Operating expenses: *                                                  |   |                                                                    |   |   |                                                                                                  |   |   |                                                                  |   |   |                                                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Salaries, wages and benefits                                           |   |                                                                    | 24.5   |   |                                                                                                  |   | 28.3   |                                                                  |   |   | 30.6                                                                                                          |   |   |   | 33.7 |   |   |   | 25.7 |   |   |   | 28.5 |   |   |   | 32.1 |   |   | 33.9 |   |
| Fuel                                                                   |   |                                                                    | 26.3   |   |                                                                                                  |   | 23.7   |                                                                  |   |   | 7.6                                                                                                           |   |   |   | 9.0 |   |   |   | 26.5 |   |   |   | 24.0 |   |   |   | 8.3 |   |   | 9.7 |   |
| Operations and maintenance                                             |   |                                                                    | 6.5    |   |                                                                                                  |   | 6.2    |                                                                  |   |   | 8.1                                                                                                           |   |   |   | 7.4 |   |   |   | 6.4 |   |   |   | 6.4 |   |   |   | 8.0 |   |   | 7.6 |   |
| Insurance and claims                                                   |   |                                                                    | 3.8    |   |                                                                                                  |   | 3.6    |                                                                  |   |   | 4.8                                                                                                           |   |   |   | 4.2 |   |   |   | 3.6 |   |   |   | 3.5 |   |   |   | 4.5 |   |   | 4.2 |   |
| Operating taxes and licenses                                           |   |                                                                    | 1.7    |   |                                                                                                  |   | 1.9    |                                                                  |   |   | 2.1                                                                                                           |   |   |   | 2.3 |   |   |   | 1.8 |   |   |   | 1.9 |   |   |   | 2.3 |   |   | 2.2 |   |
| Communications                                                         |   |                                                                    | 0.6    |   |                                                                                                  |   | 0.7    |                                                                  |   |   | 0.8                                                                                                           |   |   |   | 0.9 |   |   |   | 0.7 |   |   |   | 0.8 |   |   |   | 0.8 |   |   | 0.9 |   |
| Depreciation and amortization                                          |   |                                                                    | 8.0    |   |                                                                                                  |   | 9.7    |                                                                  |   |   | 10.1                                                                                                          |   |   |   | 11.6 |   |   |   | 8.9 |   |   |   | 10.2 |   |   |   | 11.1 |   |   | 12.2 |   |
| Purchased transportation                                               |   |                                                                    | 15.2   |   |                                                                                                  |   | 10.3   |                                                                  |   |   | 19.1                                                                                                          |   |   |   | 12.2 |   |   |   | 14.5 |   |   |   | 10.2 |   |   |   | 18.1 |   |   | 12.1 |   |
| Miscellaneous operating expenses                                       |   |                                                                    | 1.5    |   |                                                                                                  |   | 1.6    |                                                                  |   |   | 1.9                                                                                                           |   |   |   | 2.0 |   |   |   | 1.5 |   |   |   | 1.8 |   |   |   | 1.9 |   |   | 2.1 |   |
| Total operating expenses                                               |   |                                                                    | 88.1   |   |                                                                                                  |   | 86.0   |                                                                  |   |   | 85.1                                                                                                          |   |   |   | 83.3 |   |   |   | 89.6 |   |   |   | 87.3 |   |   |   | 87.1 |   |   | 84.9 |   |
| Income from operations                                                 |   |                                                                    | 11.9   |   |                                                                                                  |   | 14.0   |                                                                  |   |   | 14.9                                                                                                          |   |   |   | 16.7 |   |   |   | 10.4 |   |   |   | 12.7 |   |   |   | 12.9 |   |   | 15.1 |   |
| Net interest income                                                    |   |                                                                    | 0.2    |   |                                                                                                  |   | 0.3    |                                                                  |   |   | 0.3                                                                                                           |   |   |   | 0.4 |   |   |   | 0.2 |   |   |   | 0.2 |   |   |   | 0.3 |   |   | 0.3 |   |
| Other income (expense)                                                 |   |                                                                    | 0.0    |   |                                                                                                  |   | (0.1   | )                                                                     |   |   | 0.0                                                                                                           |   |   |   | (0.1 | ) |   |   | 0.0 |   |   |   | 0.2 |   |   |   | 0.0 |   |   | 0.2 |   |
| Income before income taxes                                             |   |                                                                    | 12.1   |   |                                                                                                  |   | 14.2   |                                                                  |   |   | 15.2                                                                                                          |   |   |   | 17.0 |   |   |   | 10.6 |   |   |   | 13.1 |   |   |   | 13.2 |   |   | 15.6 |   |
| Income taxes                                                           |   |                                                                    | 4.9    |   |                                                                                                  |   | 5.7    |                                                                  |   |   | 6.2                                                                                                           |   |   |   | 6.8 |   |   |   | 4.3 |   |   |   | 5.1 |   |   |   | 5.3 |   |   | 6.1 |   |
| Net income                                                             |   |                                                                    | 7.2    |   |                                                                                                  |   | 8.5    |                                                                  |   |   | 9.0                                                                                                           |   |   |   | 10.2 |   |   |   | 6.3 |   |   |   | 8.0 |   |   |   | 7.9 |   |   | 9.5 |   |
|                                                                   |   |                                                                    |   |   |                                                                                                  |   |   |                                                                  |   |   |                                                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net loss attributable to noncontrolling interest                       |   |                                                                    | 0.0    |   |                                                                                                  |   | 0.0    |                                                                  |   |   | 0.0                                                                                                           |   |   |   | 0.0 |   |   |   | 0.0 |   |   |   | 0.0 |   |   |   | 0.0 |   |   | 0.0 |   |
| Net income attributable to Knight Transportation                       |   |                                                                    | 7.2    | %      |                                                                                                  |   | 8.5    | %                                                                     |   |   | 9.0                                                                                                           | % |   |   | 10.2 | % |   |   | 6.3 | % |   |   | 8.0 | % |   |   | 7.9 | % |   | 9.5 | % |
|                                                                   |   |                                                                    |   |   |                                                                                                  |   |   |                                                                  |   |   |                                                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| *    There are minor rounding differences in the table. |   |                                                                    |

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| Period              |   | Total Number of Shares Purchased |      |   | Average Price Paid per Share |   |   | Total Number of Shares Purchased as Part of Publicly Announced Program |   |      | Maximum Number of Shares that May Yet Be Purchased Under the Program |   |
|---------------------|--------|----------------------------------|-----------|--------|------------------------------|--------|--------|------------------------------------------------------------------------|--------|-----------|----------------------------------------------------------------------|--------|
| 04/01/11 - 04/30/11 |   |                             | 407,000   |   |                         | $18.06 |   |                                                                   |   | 407,000   |                                                                 |   |   | 1,613,956 | (1) |
| 05/01/11 - 05/31/11 |   |                             | 2,182,873 |   |                         | $17.45 |   |                                                                   |   | 2,182,873 |                                                                 |   |   | 9,431,083 | (1) (2) |
| 06/01/11 - 06/30/11 |   |                             | 845,127   |   |                         | $16.28 |   |                                                                   |   | 845,127   |                                                                 |   |   | 8,585,956 |   |
| Total               |   |                             | 3,435,000 |   |                         | $17.23 |   |                                                                   |   | 3,435,000 |                                                                 |   |   | 8,858,956 |   |

| (1)    | On November 13, 2008, our Board of Directors unanimously authorized the repurchase of up to 3.0 million shares of our common stock. As of March 31, 2011, there were 2,020,956 shares remaining for future purchases under our repurchase program that was authorized in 2008.                                                                                                                                    |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   |                                                                                                                                                                                                                                                                                                                                                                                                              |
| (2)    | On May 19, 2011, our Board of Directors unanimously authorized the repurchase of an additional 10.0 million shares of our common stock.  During the month of May 2011, we repurchased 1,613,956 shares under the November 2008 authorization and 568,917 shares under the May 2011 authorization.  The repurchase program authorized in 2008 has expired with the purchases made in May 2011. |

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| Exhibit No. |             | Description                                                                                                                                                                                                    |
|-------------|------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|        |             |                                                                                                                                                                                                           |
| Exhibit 3   |             | Articles of Incorporation and Bylaws                                                                                                                                                                           |
|        |             |                                                                                                                                                                                                           |
|        | (3.1)            | Second Amended and Restated Articles of Incorporation of the Company. (Incorporated by reference to Appendix A to the Company's Definitive Proxy Statement on Schedule 14A filed April 20, 2007.)              |
|        |             |                                                                                                                                                                                                           |
|        | (3.2)            | 2010 Amended and Restated Bylaws of the Company. (Incorporated by reference to Exhibit 3 to the Company's Report on Form 8-K dated March 15, 2010 and filed on March 17, 2010.)                                |
|        |             |                                                                                                                                                                                                           |
| Exhibit 4   |             | Instruments defining the rights of security holders, including indentures                                                                                                                                      |
|        |             |                                                                                                                                                                                                           |
|        | (4.1)            | Articles 4, 10, and 11 of the Second Amended and Restated Articles of Incorporation of the Company.  (Incorporated by reference to Exhibit 3.1 to this Report on Form 10-Q.)                         |
|        |             |                                                                                                                                                                                                           |
|        | (4.2)            | Sections 2 and 5 of the 2010 Amended and Restated Bylaws of the Company.  (Incorporated by reference to Exhibit 3.2 to this Report on Form 10-Q.)                                                    |
|        |             |                                                                                                                                                                                                           |
|        | (4.3)            | Knight Transportation, Inc. Amended and Restated 2003 Stock Option and Equity Compensation Plan. (Incorporated by reference to the Company's Definitive Proxy Statement on Schedule 14A filed April 10, 2009.) |
|        |             |                                                                                                                                                                                                           |
|        | (4.4)            | Knight Transportation, Inc. Employee Stock Purchase Plan. (Incorporated by reference to the Company's Definitive Proxy Statement on Schedule 14A filed April 10, 2009.)                                        |
|        |             |                                                                                                                                                                                                           |
| Exhibit 31  |             | Section 302 Certifications                                                                                                                                                                                     |
|        |             |                                                                                                                                                                                                           |
|        | (31.1)*          | Certification pursuant to Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, by Kevin P. Knight, the Company's Chief Executive Officer.                  |
|        |             |                                                                                                                                                                                                           |
|        | (31.2)*          | Certification pursuant to Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, by David A. Jackson, the Company's Chief Financial Officer.                 |
|        |             |                                                                                                                                                                                                           |
| Exhibit 32  |             | Section 906 Certifications                                                                                                                                                                                     |
|        |             |                                                                                                                                                                                                           |
|        | (32.1)*          | Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, by Kevin P. Knight, the Company's Chief Executive Officer.                             |
|        |             |                                                                                                                                                                                                           |
|        | (32.2)*          | Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, by David A. Jackson, the Company's Chief Financial Officer.                            |
|        |             |
|        |             |                                                                                                                                                                                                           |
|        | *Filed herewith. |
|        |             |

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SIGNATURES

|                            |   | KNIGHT TRANSPORTATION, INC.                                                                    |
|---------------------------------|--------|------------------------------------------------------------------------------------------------|
|                            |   |                                                                                           |
|                            |   |                                                                                           |
|                            |   |                                                                                           |
| Date:  August 9, 2011 | By:    | /s/ Kevin P. Knight                                                                            |
|                            |   | Kevin P. Knight                                                                                |
|                            |   | Chief Executive Officer, in his capacity as such and on behalf of the registrant               |
|                            |   |                                                                                           |
|                            |   |                                                                                           |
|                            |   |                                                                                           |
| Date:  August 9, 2011 | By:    | /s/ David A. Jackson                                                                           |
|                            |   | David A. Jackson                                                                               |
|                            |   | President and Chief Financial Officer, in his capacity as such and on behalf of the registrant |