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EXHIBIT
10.15
 CREDIT AGREEMENT
 BY AND AMONG
 CRICKET COMMUNICATIONS, INC.
(AS LENDER)
 AND
 DENALI SPECTRUM LICENSE, LLC
(AS BORROWER)
 AND
 DENALI SPECTRUM, LLC
(AS GUARANTOR)
 Dated as of July 13, 2006




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CREDIT AGREEMENT
 Credit Agreement Effective Date Lender Borrower Guarantor
 RECITALS
 Auction
 DSM




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AGREEMENT
  Section 1. Defined Terms and Rules of Interpretation
 1.1 Definitions.
 Acquisition Sub-Limit
 Affiliate
 Applicable Law
 Auction
 Auction Benefits
 Auction Date
 Auction Funds
 Balance Amount Section 2.2(a)(iii)
 Bidding Credit
 Bidding Protocol
 2




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Borrower
 Borrower Change in Control Event
 Borrower Material Adverse Effect
 Borrower Obligations
 Borrower Subsidiary
 Build-Out
 Build-Out Loan Request Section 2.2(b)(i)
 Build-Out Sub-Limit
 3




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Business
 Business Day
 Claims Section 8.4
 Commercial Mobile Radio Service CMRS
 Commitment Period
 Control
 Control Agreement
 Credit Agreement
 4




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Cricket
 Default Rate Section 2.3(f)
 Down Payment Date Section 2.2(a)(ii)
 DSM
 DSM Lien provided however minus minus
 DSM Pledge Agreement
 DSM Security Agreement
 DSM Security Documents
 Effective Date
 Event of Default Section 7.1
 Excess Cash
 5




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FCC
 FCC Rules
 Financing Statements
 Funding Date
 GAAP
 Governmental Entity
 Guarantor
 Guarantor Change in Control Event
 Guarantor Material Adverse Effect
 6




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Guarantor Obligations Section 3
 Initial Loan Amount Section 2.2(a)(i)
 Initial Loan Date Section 2.2(a)(i)
 Intercreditor and Subordination Agreement
 Interest Purchase Agreement
 Judgment
 Lender
 License
 License System
 Litigation
 LLC Agreement
 Loan Commitment Amount
 Loan Documents
 7




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Loan Parties
 Loans
 Management Agreement
 Mandatory Prepayment Date
 Maturity Date provided however
 Member(s)
 Note Exhibit
B
 Permitted Disposition
 8




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Permitted Distribution provided
 Permitted Liens provided however Section 6.9(b)
 Person
 Pledge Agreement Exhibit A
 POPs
 Refund
 Refund Date
 9




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Required Capital Contributions
 Sale Offer
 Security Agreement Exhibit C
 Subsidiary
 Trademark License Agreement
 Winning Bidder
 Working Capital
 1.2 Rules of Interpretation.
    10




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11




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Section 2. Terms of Loan
 2.1 The Loans.
 provided however
 2.2 Procedure for Borrowing.
  Initial Loan Date Initial Loan Amount
 Down Payment Date Down Payment Amount plus less less
  12




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Balance Amount less Section
2.2(a)(ii) Winning Bidder Balance Amount Loan
 Section 2.2(a)
  Build-Out Loan
Request Section 2.2(b)(i) Section 2.2(a) Section 2.2(b)(i)
 Section 2.2(b)(i) Section 2.2(b)(ii)
 13




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Section 2.3(c) Section 2.3(c)
 Section 2.3(c)
  2.3 Interest Rates and Payments.
  Section 8.10
 Section 2.3(d)
 14




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Section 2.2(d)
  Default Rate Section 2.3(f) Section
2.2(d)
 2.4 Conditions Precedent to Lenders Obligation to Make Any Loan.
   Section 3.7
     15




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Section 5
 Section 6 Section 3, Section
3.7
  16




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2.5 Security Documents.
       17




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provided however minus minus
 Section 3. Guarantee
 3.1 Guarantee.
   3.2 Amendments, Etc. with Respect to the Borrower Obligations.
 Section
3
 18




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3.3 Guarantee Absolute and Unconditional.
 Section 3 Section 3 Section 3 Section 3 Section 3 Section
3
 3.4 Reinstatement.
 Section 3
 19




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3.5 Payments.
 Section 8.10
 3.6 Coordination with Permitted Distributions.
  3.7 Guarantees by Borrower Subsidiaries.
 Exhibit D
 Section 4. Representations and Warranties of Lender
  4.1 Organization and Standing.
  4.2 Authorization by Lender.
   20




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Section 5. Representations and Warranties of the Loan Parties
  5.1 Organization and Standing of Loan Parties.
  5.2 Authorization by the Loan Parties; Consents.
   21




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22




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5.3 Litigation.
  5.4 Compliance with Applicable Law.
  5.5 Subsidiaries.
 Section 6.15
 5.6 Absence of Defaults.
  23




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5.7 Indebtedness.
  5.8 FCC Qualifications.
  5.9 Business and Financial Experience.
  5.10 Accuracy and Completeness of Information.
  Section 6. Covenants of the Loan Parties
  6.1 Use of Proceeds.
   24




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6.2 Compliance with other Agreements.
  6.3 Payment.
  6.4 Existence.
  6.5 Compliance with Laws, Taxes, Etc.
 Section
6.5
 6.6 Books and Records.
  25




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6.7 Assets and Insurance.
  6.8 Financial Statements and Other Reports.
  Annual Statements
 Quarterly Statements
 26




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Monthly Statements
 Certain Notices
    Other Information
 6.9 Indebtedness.
     27




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6.10 Investments.
 S&P Moodys Section 6.9(b)
 28




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6.11 Negative Covenants.
 Section
6.11 provided however Section
6.11(g)
  Section 6.11(a) Section 6.15(a)
    Section 6.10
  29




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6.12 Real Property.
  6.13 Further Assurances.
 Section 2.4(a)(iv) Section
2.4(a)(viii)
  6.14 Independence of Covenants.
  6.15 Build-Out and Operation of the Licenses.
   30




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6.16 Dividends, Distributions or Return of Capital.
  Section 6.16
 Consolidated Leverage Ratio
 Consolidated EBITDA plus minus
 31




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Consolidated Net Income
 provided
 6.17 Liens.
  6.18 Disposition of Assets.
  6.19 Separateness Covenants.
  32




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33




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Section 7. Events of Default and their Effect
 7.1 Events of Default.
 Event of Default
 Failure to Pay
 Breaches of Other Covenants provided however Section
6.11 Section 6.16 Section 6.18 provided further
 Bankruptcy or Insolvency Proceedings
 34




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Representations and Warranties Section 5.4 5.6 5.7
 Change in Control
 Termination of LLC Agreement
 Loan Documents
 Loss of Status
 35




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Cross Default Section 6.9 provided however
 7.2 Remedies Upon Event of Default.
 provided Section 7.1(c) 7.1(e) 7.1(h)
  36




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Section 8. Miscellaneous
 8.1 Entire Agreement; Amendment.
  8.2 Successors and Assigns.
 provided provided further
 8.3 Rights and Remedies.
  37




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8.4 Indemnity; Reimbursement of Lender.
 Claims
 Section 8.4
 8.5 Highest Lawful Rate.
  8.6 Counterparts.
  8.7 Modification and Waiver.
  38




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8.8 Payments on Business Days.
  8.9 Expenses.
  8.10 Notices.
  If to Lender:
    
    Cricket Communications, Inc.
10307 Pacific Center Court
San Diego, CA 92121
Attention: Tim Ostrowski and General Counsel
Fax: (858) 882-6040With a copy (which shall
not constitute notice) to:
    
    Latham & Watkins LLP
12636 High Bluff Drive, Suite 400
San Diego, CA 92130
Attention: Barry M. Clarkson, Esq.
Fax: (858) 523-5450If to Borrower:
    
    Denali Spectrum License, LLC
c/o Doyon, Limited
1 Doyon Place
Suite 300
Fairbanks, AK 99701-2941
Attention: Daniel S. Osborn
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Fax: (907) 459-2075With copies (which shall not constitute notice) to:
    
    Kirkland & Ellis LLP
Citigroup Center
153 East 53rd Street
New York, NY 10022
Attention: Michael A. Brosse
Fax: (212) 446-6460and
    
    Denali Spectrum Manager, LLC
c/o Doyon, Limited
1 Doyon Place
Suite 300
Fairbanks, AK 99701-2941
Attention: Daniel S. Osborn
Fax: (907) 459-2075If to Guarantor:
    
    Denali Spectrum, LLC
c/o Doyon, Limited
1 Doyon Place
Suite 300
Fairbanks, AK 99701-2941
Attention: Daniel S. Osborn
Fax: (907) 459-2075With copies (which shall not constitute notice) to:
    
    Kirkland & Ellis LLP
Citigroup Center
1513 East 53rd Street
New York, NY 10022
Attention: Michael A. Brosse
Fax: (212) 446-6460and
    
    Denali Spectrum Manager, LLC
c/o Doyon, Limited
1 Doyon Place
Suite 300
Fairbanks, AK 99701-2941
Attention: Daniel S. Osborn
Fax: (907) 459-2075
  40




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8.11 Severability.
  8.12 Reformation.
 provided
 provided
 8.13 Governing Law.
  8.14 Arbitration.
 Arbitration
 41




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Interim Relief
 Discovery
 Depositions
 Award
 Consent to Consolidation of Arbitrations
 42




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8.15 Lenders Discretion.
  8.16 Headings.
  [Remainder of Page Intentionally Blank; Signature Page Follows]
 43




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CRICKET COMMUNICATIONS, INC.,
    
    DENALI SPECTRUM LICENSE, LLC,as Lender
    
    as BorrowerBy:
    
    /s/ S.D. Hutcheson
    
    By
    
    Denali Spectrum, LLCName:
    
    S.D. Hutcheson
    
    
    
    Its sole memberTitle:
    
    Pres. & C.E.O.By
    
    Denali Spectrum Manager, LLCIts ManagerBy
    
    Doyon, Limited,Its ManagerBy:
    
    /s/ Daniel S. OsbornName:
    
    Daniel S. OsbornTitle:
    
    Assistant TreasurerDENALI SPECTRUM, LLC,as GuarantorBy
    
    Denali Spectrum Manager, LLCIts ManagerBy
    
    Doyon, Limited,Its ManagerBy:
    
    /s/ Daniel S. OsbornName:
    
    Daniel S. OsbornTitle:
    
    Assistant Treasurer
 SIGNATURE PAGE TO CREDIT AGREEMENT




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EXHIBITS:
 A.
    
    FORM OF PLEDGE AGREEMENTB.
    
    FORM OF PROMISSORY NOTEC.
    
    FORM OF SECURITY AGREEMENTD.
    
    FORM OF SUBSIDIARY GUARANTY