<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                   FORM 10-Q


                   Quarterly Report Under Section 13 or 15(d)
                     of the Securities Exchange Act of 1934


                        For Quarter Ended March 31, 1999
                         Commission File Number 1-4929



                               COMSAT CORPORATION
                             6560 Rock Spring Drive
                              Bethesda, MD  20817
                                 (301) 214-3000



             District of Columbia                        52-0781863
       (State or other jurisdiction of                (I.R.S. Employer
        incorporation or organization)               Identification No.)



     Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding twelve (12) months (or for such shorter period that
the Registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past ninety (90) days.  Yes [X]   No [ ]

52,672,288 shares of the Registrant's common stock were outstanding as of 
March 31, 1999.
<PAGE>
 
PART I.   Financial Information

Item 1.   Interim Financial Statements for the Corporation (Unaudited)

                      COMSAT CORPORATION AND SUBSIDIARIES
                    Condensed Consolidated Income Statements

<TABLE>
<CAPTION>
                                                Three Months Ended March 31,
                                               -----------------------------
In thousands, except per share amounts                   1999        1998
----------------------------------------------------------------------------
<S>                                                <C>          <C>
Revenues                                             $144,541    $144,717
                                                    ---------   ---------
 
Operating expenses:
   Cost of services                                    80,502      65,945
   Depreciation and amortization                       42,506      51,495
   Research and development                             1,720       1,798
   General and administrative                           5,201       5,803
   Merger costs                                         1,836           -
                                                    ---------   ---------
   Total operating expenses                           131,765     125,041
                                                    ---------   ---------
 
Operating income                                       12,776      19,676
 
Other income (expense), net                            17,097      (2,825)
Interest costs, net of amounts capitalized             (9,777)    (11,332)
                                                    ---------   ---------
Income before income taxes                             20,096       5,519
Income tax expense                                     (8,070)     (1,669)
                                                    ---------   ---------
 
Net income                                           $ 12,026    $  3,850
                                                    =========   =========
 
Earnings per common share:
   Basic                                                $0.23       $0.08
   Assuming dilution                                     0.22        0.07
</TABLE>

The accompanying notes are an integral part of these financial statements.


 

                                       2
<PAGE>
 
                      COMSAT CORPORATION AND SUBSIDIARIES
                     Condensed Consolidated Balance Sheets

<TABLE>
<CAPTION>
                                                                March 31,   December 31,
In thousands                                                        1999           1998
---------------------------------------------------------------------------------------
<S>                                                           <C>          <C>
ASSETS
------
Current assets:
   Cash and cash equivalents                                  $   42,596     $   30,795
   Receivables                                                   139,844        131,052
   Other                                                          39,221         37,118
                                                              ----------     ----------
     Total current assets                                        221,661        198,965
                                                              ----------     ----------
 
Property and equipment (net of accumulated depreciation                                 
   of $1,085,054 in 1999 and $1,298,336 in 1998)                 943,751      1,209,462 
Investments                                                      392,740        249,064
Other assets                                                     127,423        133,307
                                                              ----------     ----------
      Total assets                                            $1,685,575     $1,790,798
                                                              ==========     ==========
 
LIABILITIES AND STOCKHOLDERS' EQUITY
------------------------------------
Current liabilities:
   Current maturities of long-term debt                       $   29,758     $   14,962
   Accounts payable and accrued liabilities                      109,008         88,297
   Due to related parties                                         31,911         30,424
   Other                                                          11,429          7,119
                                                              ----------     ----------
      Total current liabilities                                  182,106        140,802
                                                              ----------     ----------
 
Long-term debt                                                   367,536        446,832
Deferred income taxes and investment tax credits                 136,866        133,509
Accrued post-retirement benefit costs                             49,173         48,923
Other long-term liabilities                                      141,715        161,692
Preferred securities issued by subsidiary                        200,000        200,000
 
Stockholders' equity:
   Common stock                                                  433,173        430,537
   Retained earnings                                             252,204        242,809
   Treasury stock                                                 (6,065)        (3,109)
   Unearned compensation                                          (3,657)        (4,652)
   Accumulated other comprehensive loss                          (67,476)        (6,545)
                                                              ----------     ----------
      Total stockholders' equity                                 608,179        659,040
                                                              ----------     ----------
      Total liabilities and stockholders' equity              $1,685,575     $1,790,798
                                                              ==========     ==========
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                       3
<PAGE>
 
                      COMSAT CORPORATION AND SUBSIDIARIES
                  Condensed Consolidated Cash Flow Statements

<TABLE>
<CAPTION>
                                                            Three Months Ended March 31,
                                                            ----------------------------
In thousands                                                         1999           1998
----------------------------------------------------------------------------------------
<S>                                                           <C>             <C>
Cash flows from operating activities:
   Net income                                                    $ 12,026       $  3,850
   Adjustments to reconcile net income to net cash 
    provided by continuing operations:
      Depreciation and amortization                                42,506         51,495
      Equity in earnings of Inmarsat                               (5,833)             -
      Gain on sale of investments                                 (13,075)          (919)
      Write-off of investment                                           -          1,950
   Changes in operating assets and liabilities                      7,350        (26,869)
   Other                                                            1,770          2,264
                                                                 --------       --------
   Net cash provided by continuing operations                      44,744         31,771
   Net cash used by discontinued operations                        (5,323)        (2,557)
                                                                 --------       --------
   Net cash provided by operating activities                       39,421         29,214
                                                                 --------       --------
 
Cash flows from investing activities:
   Purchase of property and equipment                             (28,038)       (52,861)
   Investments in unconsolidated businesses                             -         (5,113)
   Proceeds from sale of investments                               15,100          1,200
   Increase in INTELSAT ownership                                 (38,064)          (689)
   Distribution from Inmarsat                                      31,248              -
   Decrease in Inmarsat ownership                                       -          5,999
   Other                                                              330          1,336
                                                                 --------       --------
   Net cash used in investing activities                          (19,424)       (50,128)
                                                                 --------       --------
 
Cash flows from financing activities:
   Common stock issued                                              1,673         30,513
   Cash dividends paid                                             (2,631)        (2,530)
   Repayment of long-term debt                                     (7,238)             -
   Net short-term borrowings (repayments)                               -         (4,831)
                                                                 --------       --------
   Net cash provided (used) by financing activities                (8,196)        23,152
                                                                  --------       --------
 
Net increase in cash and cash equivalents                          11,801          2,238
Cash and cash equivalents, beginning of period                     30,795          5,757
                                                                 --------       --------
 
Cash and cash equivalents, end of period                         $ 42,596       $  7,995
                                                                 ========       ========
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                       4
<PAGE>
 
                      COMSAT CORPORATION AND SUBSIDIARIES
        Notes to Condensed Consolidated Financial Statements (Unaudited)

1.   Financial Statement Presentation

     The accompanying unaudited condensed consolidated financial statements have
     been prepared by COMSAT Corporation pursuant to the rules and regulations
     of the SEC. These financial statements should be read together with the
     financial statements and notes in our 1998 Annual Report on Form 10-K filed
     with the SEC.  Certain information and footnote disclosures normally
     included in financial statements prepared in accordance with generally
     accepted accounting principles have been condensed or omitted.  The
     accompanying condensed consolidated financial statements reflect all
     adjustments and disclosures which, in our opinion, are necessary for a fair
     presentation.  All such adjustments are of a normal recurring nature.  The
     results of operations for the interim periods are not necessarily
     indicative of the results of the entire year.

2.   Agreement and Plan of Merger with Lockheed Martin Corporation

     COMSAT and Lockheed Martin Corporation entered into an Agreement and Plan
     of Merger on September 18, 1998.  Under the terms of the merger agreement,
     Lockheed Martin will acquire all of the outstanding common stock of COMSAT
     in a two-step transaction.  We incurred merger costs of $1.8 million in the
     first quarter of 1999 in connection with the proposed merger.  See
     "Management's Discussion and Analysis of Financial Condition and Results of
     Operations - Outlook" on page 15 of this Form 10-Q and in Note 2 to the
     financial statements in our 1998 Form 10-K for additional information
     regarding the merger.

3.   Inmarsat Privatization

     Inmarsat completed its privatization on April 15, 1999.  As a result, we
     now use the equity method of accounting to report our 22.2% ownership in
     the new company.  Prior to 1999, we consolidated our share of the accounts
     of Inmarsat and reported our share of Inmarsat's revenues (net of space
     segment costs paid to Inmarsat), cost of services, depreciation and
     amortization and interest costs in the respective categories of our income
     statement.  We now report our proportionate share of Inmarsat's net
     operating results ($5.8 million in the first quarter of 1999) as equity
     income in the "Other income (expense), net" category of our income
     statement.  Space segment charges paid to Inmarsat are now reported in cost
     of services.

     As a result of the Inmarsat privatization and consistent with the equity
     method of accounting, we have reclassified the following to investments:
     $245.6 million from property and equipment, $15.0 million from current
     maturities of long-term debt, $13.3 million from due to related parties and
     $60.0 million from long-term debt.  Such amounts total $157.3 million and,
     when combined with our proportionate share of Inmarsat's 


                                       5
<PAGE>
 
     ownership of ICO Global Communications (Holdings) Limited of $34.7 
     million, established our $192.0 million investment in the privatized 
     Inmarsat at March 31, 1999.  

     During March 1999, Inmarsat made a special cash distribution to the
     signatories. We recorded our share of the distribution of $31.2 million as
     a reduction of our investment in Inmarsat.

4.   INTELSAT Share Change

     We paid $38.1 million to increase our total ownership share of INTELSAT
     from 18.4% at December 31, 1998 to 20.4% as of March 31, 1999.

5.   Regulatory Environment and Litigation

     Regulatory Environment. Under the Communications Satellite Act of 1962, the
     International Maritime Satellite Act of 1978 and the Communications Act of
     1934, COMSAT is subject to regulation by the Federal Communications
     Commission with respect to its capital and organizational structure, and
     with respect to its World Systems and Mobile Communications businesses.
     FCC decisions and policies have had and will continue to have a significant
     impact on COMSAT.  In addition, the telecommunications companies which we
     operate in various developing countries are subject to regulation by the
     local regulatory bodies in those countries.  Because the regulatory
     environment in those countries is rapidly evolving as the local economies
     are developing, these companies face increasing business uncertainties that
     could have an adverse effect on their operations.

     On October 28, 1998, the FCC issued a notice of proposed rulemaking that
     looks toward enabling users to have direct access to the INTELSAT system,
     which would end our status as the exclusive provider of INTELSAT services
     in the U.S.  Legislation also has been introduced in the Senate to amend
     the Satellite Act.  We discuss these regulatory and legislative
     developments under "Management's Discussion and Analysis of Financial
     Condition and Results of Operations - Outlook" on page 18 of this 
     Form 10-Q.

     Litigation.  COMSAT and its subsidiaries are a party to various lawsuits
     and arbitration proceedings, and are subject to various claims and
     inquiries, which generally are incidental to the ordinary course of our
     business.  See Note 8 for a description of an arbitration proceeding
     related to the Green Bank contract to which we are a party.  The outcome of
     legal proceedings cannot be predicted with certainty.  Based on currently
     available information, however, we do not believe that the outcome of any
     matter which is pending or threatened, either individually or in the
     aggregate, will have a material adverse effect on our long-term
     consolidated financial condition.  Nevertheless, the outcome of such
     matters could materially affect our consolidated results of operations in a
     given year or quarter.

     
                                       6
<PAGE>
 
     In January 1999, the U.S. Department of Justice announced that it intended
     to join a lawsuit filed by former employees of Electromechanical Systems,
     Inc. under the qui tam provisions of the Civil False Claims Act. We
     acquired Electromechanical Systems in 1994 as part of our acquisition of
     Radiation Systems, Inc., which became part of COMSAT RSI, Inc. We began
     accounting for COMSAT RSI as a discontinued operation in 1997 and retained
     Electromechanical Systems when we sold COMSAT RSI in 1998 (see Note 8). The
     lawsuit names Electromechanical Systems, COMSAT, COMSAT RSI, and several
     current and former Electromechanical Systems employees and seeks potential
     damages estimated at up to $40.0 million. The Department of Justice is
     expected to file its own complaint in this matter and seek to stay the
     lawsuit pending the outcome of a separate criminal investigation into the
     same allegations that is currently being conducted by the U.S. Attorney's
     office in Tampa, Florida. We intend to vigorously defend this matter but
     cannot predict the ultimate outcome or estimate the amount of liability
     that could result from any civil or criminal sanctions the government may
     seek.

6.   Earnings Per Share

     The following reconciliation illustrates the calculation of our basic and
     diluted earnings per share amounts for the three month periods ended 
     March 31, 1999 and 1998:

<TABLE>
<CAPTION>
                                                   Three Months Ended
                                                        March 31,    
                                                 -----------------------
     In millions, except per share amounts               1999       1998   
     -------------------------------------------------------------------
                                                                        
     <S>                                            <C>        <C>      
     Net income                                       $12.0      $ 3.9
                                                     =======    =======
                                                                        
     Basic:                                                             
      Weighted average shares outstanding              52.5       50.4
                                                     =======    =======
         Per share                                    $0.23      $0.08
                                                     =======    =======
                                                                        
     Assuming dilution:                                                 
      Weighted average shares outstanding              52.5       50.4
      Stock options                                     1.1        1.6
      Restricted stock awards and units                 0.1        0.2
                                                     -------    ------- 
      Total                                            53.7       52.2
                                                     =======    =======
         Per share                                    $0.22      $0.07
                                                     =======    =======
</TABLE>

                                       7
<PAGE>
 
7.   Comprehensive Income

     Comprehensive income consists of net income and other gains and losses
     affecting our stockholders' equity that, under generally accepted
     accounting principles, are excluded from net income.  For COMSAT, such
     items consist primarily of foreign currency translation gains and losses
     and unrealized gains and losses on marketable equity securities.  The
     components of total comprehensive income (loss) are presented in the
     following table:

<TABLE>
<CAPTION>
                                                    Three Months Ended
                                                         March 31,    
                                                 ------------------------
     In millions                                          1999       1998  
     --------------------------------------------------------------------
                                                                         
     <S>                                             <C>        <C>     
     Net income                                         $ 12.0      $ 3.9
     Other comprehensive income (loss):                                  
      Unrealized gain (loss) on securities               (10.5)      12.2
      Foreign currency translation                       (50.4)       0.2
                                                       =======     ======
     Total comprehensive income (loss)                  $(48.9)     $16.3
                                                       =======     ====== 
</TABLE>

     The foreign currency translation loss resulted from the devaluation of the
     Brazilian currency (the Real) during the first quarter of this year.  The
     unrealized loss on securities includes a reclassification adjustment of
     $8.5 million, net of tax, related to a sale of marketable securities.

8.   Discontinued Operations

     On June 25, 1998, we sold substantially all of COMSAT RSI, Inc.  In
     connection with the sale, COMSAT and the purchaser agreed to indemnify each
     other against certain losses. Our indemnification obligations generally are
     limited to losses incurred in excess of an agreed threshold amount 
     ($6.7 million) and are capped at a maximum agreed amount ($28.0 million) in
     respect of claims made within an agreed survival period (generally,
     approximately two years). In certain instances, however our indemnification
     obligations are not subject to those limitations.

     Certain of COMSAT RSI's assets were excluded from the sale and retained by
     COMSAT, including Electromechanical Systems, Inc. and a long-term
     construction contract for a radio astronomy telescope in Green Bank, West
     Virginia.  We also retained a claim against the prime contractor to recover
     $29.0 million in costs incurred in performing the Green Bank contract,
     which are in excess of the original contract value.  The prime contractor
     has filed a counterclaim seeking $12.9 million in damages for delay.  The
     claim and counterclaim are currently in arbitration.  We may not be
     successful in collecting all or any portion of this claim.

     The loss upon disposition of discontinued operations is based upon our best
     estimates of the costs to complete the Green Bank contract, the amount to
     be realized from the $29.0 million Green Bank contract arbitration claim,
     potential indemnification claims and other

                                       8

<PAGE>
 
     costs related to the discontinued operations. These estimates could 
     change as additional costs are incurred to complete the Green Bank 
     contract, upon resolutioin of the arbitration and upon resolution of 
     other matters related to the COMSAT RSI discontinued operations. 

     The net assets of COMSAT RSI remaining were $20.3 million at March 31, 1999
     and were $15.0 million at December 31, 1998. The net assets primarily
     consist of receivables on long-term contracts, fixed assets, current
     liabilities and the remaining reserve for the estimated loss on disposal.
 
9.   New Accounting Pronouncements

     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
     "Accounting for Derivative Instruments and Hedging Activities."  The
     statement requires companies to recognize all derivatives as either assets
     or liabilities, with the instruments measured at fair value.  The
     accounting for changes in fair value and gains or losses depends on the
     intended use of the derivative and its resulting designation.  The
     statement is effective for fiscal years beginning after June 15, 1999. We
     will adopt SFAS No. 133 in the first quarter of 2000. We are evaluating the
     impact that implementation of SFAS No. 133 will have on our consolidated
     financial statements.

10.  Segment Information

     Selected information regarding our operating segments, World Systems (CWS),
     Mobile Communications (CMC), International (CI) and Laboratories (Labs)
     follows:
 
<TABLE>
<CAPTION>
                                      Satellite Services                                 
                                    ----------------------
     In millions                     CWS     CMC     Total     CI      Labs    Other    Total 
     -----------------------------------------------------------------------------------------
     For the three months ended:                                                              
     March 31, 1999                                                                           
     <S>                            <C>     <C>     <C>      <C>      <C>     <C>      <C>    
                                                                                              
     Revenues:                                                                                
      External customers             $78.4   $29.6   $108.0   $27.7    $8.8    $   -    $144.5
      Intersegment                     0.5     0.1      0.6       -     1.1     (1.7)        -
                                  ------------------------------------------------------------
        Total                         78.9    29.7    108.6    27.7     9.9     (1.7)    144.5
                                  ------------------------------------------------------------
                                                                                              
     Segment income (loss)            29.3     4.8     34.1     8.8    (1.5)   (21.3)     20.1
     -----------------------------------------------------------------------------------------
                                                                                              
     March 31, 1998                                                                           
                                                                                              
     Revenues:                                                                                
      External customers             $72.4   $40.2   $112.6   $25.1    $7.0    $   -    $144.7
     Intersegment                      0.6     0.6      1.2       -     2.0     (3.2)        -
                                  ------------------------------------------------------------
     Total                            73.0    40.8    113.8    25.1     9.0     (3.2)    144.7
                                  ------------------------------------------------------------
                                                                                              
     Segment income (loss)            26.0     8.9     34.9    (4.4)   (2.5)   (22.5)      5.5
     ----------------------------------------------------------------------------------------- 
</TABLE>


                                       9
<PAGE>
 
     We evaluate the performance of our operating segments based on income
     (loss) before income taxes and interest costs. The "Other" column includes
     the elimination of intersegment revenues, corporate related items, and
     interest costs, net of amounts capitalized. We continue to report our
     proportionate share of Inmarsat's net operating results in the Mobile
     Communications' segment.

     Mobile Communications' total assets declined from $454.7 million at
     December 31, 1998 to $344.8 million at March 31, 1999, primarily as a
     result of the Inmarsat privatization (see note 3).







    







    

                                       10
<PAGE>
 
Item 2:   Management's Discussion and Analysis of Financial Condition and
          Results of Operations for the Quarter Ended March 31, 1999

                             ANALYSIS OF OPERATIONS

Consolidated Operations

     Mobile Communications, one of our four operating segments, now uses the
equity method to account for our 22.2% investment in Inmarsat.  Prior to 1999,
we used the pro rata method of consolidation to report our share of Inmarsat's
operating results.  The change in accounting method did not affect our
consolidated net income, but did affect certain categories on the income
statement.  We now report our proportionate share of Inmarsat's net operating
results as equity income in the "Other income (expense), net" category of the
income statement.

Revenues

     Consolidated revenues in the first quarter of 1999 were $144.5 million,
nominally below the $144.7 million reported in the same period of 1998.  Lower
revenues in Mobile Communications offset increased revenues in World Systems,
International and the Laboratories.

Operating Income

     Operating income for the first quarter was $12.8 million, or $6.9 million
below the same period of last year.  The change in the method of accounting for
our investment in Inmarsat, lower Mobile Communications revenues and costs
related to the proposed merger with Lockheed Martin Corporation predominately
caused the decrease.  Improved operating income in World Systems partially
offset those items.
 
Other Income (Expense), Net

     Other income was $17.1 million for the first quarter of 1999, compared to
expense of $2.8 million for the first quarter of 1998.  The increase reflects a
pre-tax gain of $13.1 million from International's sale of stock in Viatel, Inc.
and equity income of $5.8 million from Mobile Communications' investment in
Inmarsat.  The first quarter 1998 results included a $2.0 million non-cash
write-off of the Laboratories' investment in Superconducting Core Technologies,
Inc.
 
Interest Costs, Net of Amounts Capitalized

     Interest costs, net of amounts capitalized, were $9.8 million for the first
quarter, or $1.5 million lower than the same period of last year.  Lower levels
of borrowings and the reclassification of Mobile Communications' share of
Inmarsat interest costs to equity income, which is now reported as part of
"Other income (expense), net," generated the improvement.

                                       11
<PAGE>
 
Income before Income Taxes

     Income before income taxes for the first quarter was $20.1 million, an
improvement of $14.6 million over the same period of 1998.  The gain from the
sale of Viatel stock and higher World Systems revenues created the improvement.
Lower Mobile Communications revenues and costs associated with the proposed
merger with Lockheed Martin partially offset those items.

Income Tax Expense

     For the first quarter of 1999, income tax expense was $8.1 million, or $6.4
million higher than the first quarter of 1998.  Improved earnings and a higher
effective tax rate than the comparative period of 1998 led to the increase.

Net Income

     Net income for the first quarter of 1999 was $12.0 million, an improvement
of $8.2 million over the same period of last year.  Diluted earnings per share
for the first quarter of 1999 were $0.22, or $0.15 higher than the same period
of 1998.

Segment Operating Results

     We report our operating results in four segments: World Systems, Mobile
Communications, International and Laboratories.  We evaluate the performance of
our operating segments based on income (loss) before taxes and interest costs.

     In our 1998 Form 10-Q and 1997 Form 10-K reports, we presented our
operating results in two segments: Satellite Services and Network Services.  The
Satellite Services segment included World Systems and Mobile Communications.
The Network Services segment included International, Laboratories and Government
Programs.  We began reporting International and Laboratories as separate
segments in the fourth quarter of 1998.  We now include the results of
Government Programs as part of the World Systems segment.
 








    

                                       12
<PAGE>
 
Results by Segment:

<TABLE>
<CAPTION>
                                                Quarter Ended March 31,
                                              ---------------------------
    In millions                                       1999        1998
    ---------------------------------------------------------------------
    <S>                                         <C>          <C>
    REVENUES
    --------
    Satellite Services:
     World Systems                                  $ 78.9      $ 73.0
     Mobile Communications                            29.7        40.8
                                              ---------------------------
     Total Satellite Services                        108.6       113.8
                                              ---------------------------
 
    International                                     27.7        25.1
    Laboratories                                       9.9         9.0
    Eliminations and other                            (1.7)       (3.2)
                                              ---------------------------
     Total                                          $144.5      $144.7
                                              ===========================
 
    SEGMENT INCOME (LOSS)
    ---------------------
    Satellite Services:
     World Systems                                  $ 29.3      $ 26.0
     Mobile Communications                             4.8         8.9
                                              ---------------------------
     Total Satellite Services                         34.1        34.9
                                              ---------------------------
 
    International                                      8.8        (4.4)
    Laboratories                                      (1.5)       (2.5)
                                              ---------------------------
     Total segment income                             41.4        28.0
 
    General and administrative expense                (5.2)       (5.8)
    Merger costs                                      (1.8)          -
    Interest costs, net of amounts capitalized        (9.8)      (11.3)
    Other                                             (4.5)       (5.4)
                                              ---------------------------
     Total                                          $ 20.1      $  5.5
                                              ===========================
</TABLE>


World Systems

     World Systems revenues in the first quarter of 1999 were $78.9 million,
which was 8% higher than the same period of 1998.  The improvement in revenues
was primarily the result of increased demand for Internet services and other
high speed data traffic, offset by a slight decline in voice revenues.  As a
result of the increase in revenues, World Systems income in the first quarter of
$29.3 million was 13% higher than the same period of last year.

     In March 1999, we paid $38.1 million to increase our total ownership share
of INTELSAT from 18.4% to 20.4%. The increase in ownership share should
favorably affect 1999 earnings absent other factors.
 
Mobile Communications
 
     Inmarsat completed its privatization on April 15, 1999.  As a result, we
now use the equity method of accounting to report our 22.2% ownership in the new
company.  Prior to 1999, we used the pro rata method of consolidation to report
our share of Inmarsat's operating results.  Under the 

                                       13
<PAGE>
 
pro rata method of consolidation, we reported our share of Inmarsat's revenues
(net of the space segment charges that we paid to Inmarsat), cost of services,
depreciation and amortization and interest costs in the appropriate categories
of our income statement. We now report our proportionate share of Inmarsat's net
operating results as equity income in "Other income (expense), net" within the
Mobile Communications operating segment. The space segment charges that we pay
to Inmarsat are now reported in cost of services. Our share of Inmarsat's
interest costs is now reported within the Mobile Communications segment. Prior
to 1999, Inmarsat's interest costs were reported in "Interest costs, net of
amounts capitalized."
 
     Revenues in Mobile Communications for the first quarter were $29.7 million,
or 27% below the first quarter of 1998.  Lower analog telephone traffic,
principally due to lower usage in the U.S. Government sector, and lower amounts
of carrier traffic primarily caused the decline.  In addition, reporting
Inmarsat's revenues using the equity method of accounting lowered Mobile
Communications' revenues by $1.6 million.  Mobile Communications' income was
$4.8 million for the first quarter, versus $8.9 million in the first quarter of
1998.  Lower revenues and reporting our share of Inmarsat interest costs of $1.1
million within the Mobile Communications segment contributed to the decline.
The prior year's results also included a non-recurring $1.0 million gain on the
sale of an investment.

International

     International's first quarter 1999 revenues were $27.7 million, or 10%
higher than the first quarter of 1998.  Improvements in Argentina, Colombia and
Mexico more than offset lower revenues in Brazil.  Revenues in Brazil were lower
than the first quarter of 1998 and were impacted by the devaluation of the
Brazilian currency.  Income for International in the first quarter was $8.8
million, compared to a loss of $4.4 million for the same period of 1998.
International's first quarter 1999 results included a $13.1 million gain from
the sale of stock in Viatel, Inc. Excluding the sale of Viatel shares,
International's loss was $4.3 million, slightly better than the same period of
last year.

Laboratories

     The Laboratories' revenues in the first quarter of 1999 were $9.9 million,
or 10% higher than the same period last year, due to growth in our technical
consulting business.  The loss before taxes in the first quarter was $1.5
million, a $1.0 million improvement over the first quarter of 1998.  The prior
year results included a $2.0 million write-off of our investment in
Superconducting Core Technologies, Inc.  Absent this write-off, the
Laboratories' loss in the first quarter of 1999 was $1.0 million more than the
same period of 1998 and was primarily due to higher sales and marketing costs to
expand Laboratories' consulting and product businesses and increased costs in
research and development.




  

                                       14
<PAGE>
 
                                    OUTLOOK

     Many of the statements that follow are forward looking and relate to
anticipated future events and operating results.  Statements that look forward
in time are based on management's current expectations and assumptions, which
may be affected by subsequent developments and business conditions, and
necessarily involve risks and uncertainties.  These statements and the
corporation's future operating results may be affected by the timing and outcome
of regulatory and other governmental proceedings, legislative actions,
developments concerning the privatization of INTELSAT, the proposed acquisition
of COMSAT by Lockheed Martin Corporation, international and domestic business
conditions, increased competition from other satellite services providers, the
disposition of assets and completion of contracts placed in discontinued
operations, the effect of the year 2000 issue on COMSAT,  litigation and other
factors.  Therefore, there can be no assurance that actual future results will
not differ materially from anticipated results.  Although we have attempted to
identify some of the important factors that may cause actual results to differ
materially from those anticipated, those factors should not be viewed as the
only factors that may affect future operating results.
 
Business Combination with Lockheed Martin

     COMSAT entered into an Agreement and Plan of Merger with Lockheed Martin
Corporation on September 18, 1998.  Under that agreement, Lockheed Martin will
acquire all of COMSAT's outstanding common stock in a two-step transaction.

     The first step is a tender offer, which was commenced on September 25,
1998, by a subsidiary of Lockheed Martin, Regulus LLC, to purchase up to 49% of
COMSAT's outstanding common stock at a price of $45.50 per share.  The tender
offer is currently scheduled to expire on July 2, 1999 but will be extended, as
necessary, until September 18, 1999.

     The tender offer will be completed only if the conditions set forth in the
merger agreement are satisfied or, to the extent permissible, waived.  Some of
those conditions are:

  .  at least one-third of COMSAT's outstanding common stock must be tendered in
     the offer;

  .  COMSAT shareholders must approve the merger;

  .  receipt of all required consents and approvals from government authorities,
     including FCC approval for Lockheed Martin to become an authorized carrier
     and acquire up to 49% of COMSAT's common stock in the tender offer and
     expiration of all waiting periods under antitrust laws; and

  .  there is no event that has had or would reasonably be expected to have a
     material adverse effect on COMSAT.

                                       15
<PAGE>
 
     The second step is a proposed merger pursuant to which COMSAT will become a
wholly-owned subsidiary of Lockheed Martin.  In the merger, shareholders will
receive one share of Lockheed Martin common stock for each share of COMSAT
common stock that they own.

     The merger will be completed only if the conditions set forth in the merger
agreement are satisfied or, to the extent permissible, waived.  Some of those
conditions are:

  .  completion of the tender offer;

  .  amendment of the Communications Satellite Act of 1962 to permit completion
     of the merger;

  .  receipt of all consents and approvals from governmental authorities; and

  .  there is no event that has had or would reasonably be expected to have a
     significant adverse effect on COMSAT.
 
     We are working toward completing the tender offer and merger as quickly as
possible. However, we do not yet know when the tender offer or merger will be
completed as many conditions to each step are beyond our control.

     COMSAT and Lockheed Martin have estimated that the tender offer could close
in the summer of 1999.  In January 1999, Representative Tom Bliley, Chairman of
the House Committee on Commerce, and Senator Conrad Burns, Chairman of the
Senate Commerce Subcommittee on Communications, sent a letter to William E.
Kennard, Chairman of the FCC, urging the FCC not to take any action to permit
any company (including Lockheed Martin) to purchase more than 10 percent of
COMSAT prior to Congress adopting new satellite legislation.  If the FCC does
not proceed with its review of Lockheed Martin's filings related to the tender
offer, or if the FCC delays or slows its review, the tender offer may not be
completed in the summer of 1999.

     If Congress does not adopt amendments to the Satellite Act in the next few
months, the merger will not occur in 1999, even if the tender offer is
completed.  If, however, Congress adopts amendments to the Satellite Act in the
1999 legislative session, the merger may occur in late 1999 or early 2000,
depending upon when the FCC and Department of Justice grant approvals necessary
to complete the merger.  No assurance can be given that the requisite
legislation will be enacted.  If legislation enabling the merger is enacted, FCC
approval of the merger will be required in addition to the approvals required
for the tender offer.  While it is expected that the FCC would act promptly on
the matter following enabling legislation, the FCC's response time could affect
the estimated time frame for closing the merger.

     If the tender offer is not completed by September 18, 1999 or if the merger
is not completed by September 18, 2000, either Lockheed Martin or COMSAT may
terminate the merger agreement.  Lockheed Martin or COMSAT may elect not to do
this or together may elect to amend the merger agreement so that the tender
offer or merger could be completed after those dates.

                                       16
<PAGE>
 
     In connection with the execution of the merger agreement, the parties
entered into certain ancillary agreements, including a shareholders agreement, a
registration rights agreement and a carrier acquisition agreement. Those
agreements are described our 1998 Form 10-K in Note 2 to the financial
statements.

Restructuring of Inmarsat and INTELSAT

     The privatization of Inmarsat was completed on April 15, 1999.  We now own
22.2% of Inmarsat Holdings, Ltd., a new, independent commercial company based in
London, England.  The new company is not currently publicly traded.  The new
company is expected to conduct an initial public offering within approximately
two years, subject to market conditions.  As a result of the privatization, we
are using the equity method to account for our investment in the privatized
Inmarsat.  We previously used the pro rata consolidation method.  This reporting
change is not expected to have a material effect on our net income.

     In November 1998, INTELSAT transferred six satellites (five currently in
orbit and one to be launched during the 1999-2000 time frame) to New Skies
Satellites N.V.  New Skies, which is headquartered in the Netherlands, is an
entirely separate, independent company spun off from INTELSAT.  We use the cost
method to account for our 16.6% direct ownership of New Skies. Prior to its
creation, the assets and operating results relating to New Skies were included
as part of the INTELSAT system and were accounted for using the pro rata
consolidation method.  During 1998, our share of pre-tax earnings related to the
satellites transferred to New Skies was approximately $3 million.  As a result
of this change in accounting, World Systems' 1999 pre-tax earnings will be lower
by approximately this amount in the absence of other factors that may affect
operating results in World Systems.
 
     In June 1998, the FCC issued a public notice requiring U.S. earth stations
licensees using INTELSAT satellites that were scheduled to be transferred to New
Skies to file license modification applications by July 17, 1998 in order to
access the New Skies system.  Several companies, including COMSAT, filed
applications in response to this notice.  In September 1998, a competitor of New
Skies filed a petition asking the FCC to deny the applications or alternatively
to grant the applicants special temporary authority to access New Skies for a
limited period and to defer the question of permanent authority to a later date.
COMSAT, New Skies, and several of the applicants opposed this petition.  The FCC
granted special temporary authority to access New Skies following the 
November 30, 1998 asset transfer. COMSAT expects that the FCC will renew its
grant of special temporary authority until it acts on the question of permanent
authority. We cannot be assured of or predict the timing of that action. Failure
to obtain permanent authority to operate in the U.S. and other jurisdictions
could have an adverse affect on New Skies' business plans and operating results.

     INTELSAT's management and Board of Governors are continuing efforts to
transform the remaining portion of INTELSAT from a treaty-based,
intergovernmental organization to a fully private, commercial company.  At
INTELSAT's April 1999 Meeting of Signatories, the Signatories endorsed
restructuring the organization, reduced the number of restructuring options

                                       17
<PAGE>
 
under consideration and endorsed a timetable calling for the Board of Governors
to recommend a single restructuring option to the October 1999 Assembly of
Parties, so that a final decision to implement the preferred option can be made
during the fourth quarter of 2000.  Based on that timetable, it appears that
INTELSAT may be in a position to complete its restructuring prior to the 
end of 2001, the time frame we had previously established as our objective for
privatizing INTELSAT. In addition, INTELSAT has stated that, depending on the
date of incorporation of the restructured INTELSAT and prevailing market
conditions, an initial public offering may be achievable in 2002. We are
committed to privatizing the remaining portion of INTELSAT in a pro-competitive
manner at the earliest possible time. As a minority shareholder and the U.S.
Signatory to INTELSAT, however, we lack the ability to independently effect a
restructuring of INTELSAT. The success of our efforts will depend on our ability
to achieve a consensus among other Signatories and participating member
governments. A two-thirds vote of the governments that are members of INTELSAT
will be necessary for approval of any final privatization proposal.

Regulatory and Legislative Developments

     On April 24, 1998, the FCC granted our petition for reclassification as a
non-dominant common carrier in markets that currently represent over 90% of
World Systems' revenues for INTELSAT services.  For those markets, rate-of-
return regulation was lifted immediately.  On February 9, 1999, the FCC
eliminated COMSAT's remaining rate-of-return regulation along thin routes in
favor of COMSAT's incentive-based pricing plan.  That plan will lower prices for
customers on thin routes and, at the same time, ease further the regulatory
burden on COMSAT in connection with our INTELSAT business.  The FCC also adopted
a procedure for reclassifying thin routes as competition increases to make them
eligible for non-dominant treatment.

     On October 28, 1998, the FCC issued a separate notice of proposed
rulemaking that looks toward enabling users to have direct access to the
INTELSAT system, which would end COMSAT's status as the exclusive provider of
INTELSAT services in the United States.  In the direct access notice, the FCC
tentatively concluded, among other things, that it lacks the statutory authority
to impose Level 4 direct access (by which users could invest and acquire an
ownership interest in INTELSAT) but does have the authority to require Level 3
direct access (by which users could contract directly with INTELSAT for capacity
and bypass COMSAT).  The FCC sought comments on its tentative conclusion that it
would serve the public interest to mandate Level 3 direct access.  Our largest
customers and other users filed comments supporting direct access.  We filed
comments contesting the basis for the FCC's proposed action. Depending on form
and timing, the imposition of direct access could have an adverse impact on our
financial condition and results of operations.  However, we do not believe that
the FCC has the current authority to grant direct access under the Satellite Act
and would vigorously contest the exercise of such authority by the FCC.

     In October 1998, Congress passed, and the President subsequently signed,
the International Anti-Bribery Act of 1998.  The act provides that, as of May 1,
1999, an international organization providing commercial satellite services will
not be accorded immunity from suit or legal process in connection with its
provision of such service, except as required by international agreements to

                                       18
<PAGE>
 
which the United States is a party that are so designated by the President. The
Act requires the President to designate those agreements which are subject to
the exception and directs the President to take all appropriate actions to
reduce or eliminate all privileges and immunities that are not preserved by
designation. The President has since delegated this designation authority to the
Secretary of State. We opposed prior versions of this legislation but supported
it in the form ultimately passed by Congress. We do not believe that enactment
of this legislation will have a material effect on our business, because
Inmarsat was privatized before May 1, 1999, and the Department of State, acting
under delegated authority, has designated the INTELSAT Headquarters Agreement as
an international agreement to which the United States is a party, thereby
requiring the United States to continue to afford INTELSAT immunity from suit
and legal process under the Act.

     On February 4, 1999, Senator Conrad Burns, Chairman of the Senate Commerce
Subcommittee on Communications, introduced the Open-market Reorganization for
the Betterment of International Telecommunications (ORBIT) Act (S. 376).  COMSAT
believes that the ORBIT legislation, on the whole, represents a constructive 
approach to the privatization of INTELSAT and regulation of COMSAT.  
Significantly, the ORBIT legislation would repeal the ownership restrictions on
COMSAT stock upon enactment and eliminate other outdated provisions in the
Satellite Act. We do have concerns with some provisions of the bill, including a
requirement that the President withdraw the U.S. from this international
organization if full privatization goal is not achieved by 2002. Although we
believe privatization of INTELSAT will be completed rapidly, United States
withdrawal from INTELSAT in 2002, if privatization is not completed, would have
a substantial adverse effect on our financial condition and results of
operations. A hearing on the proposed ORBIT legislation was held on March 5,
1999 by the Senate Commerce Subcommittee on Communications. The proposed ORBIT
legislation was approved by the Senate Commerce Committee following a markup
session on May 5, 1999. The Senate Majority Leader and certain other Senators
have, however, expressed reservations concerning the proposed ORBIT legislation.
We do not know whether or in what form legislation will be passed by the Senate.

     The House of Representatives is also expected to consider satellite
privatization issues this year, most likely in the form of legislation being
prepared by Representative Tom Bliley, Chairman of the House Committee on
Commerce.  At this time, Representative Bliley's timetable for revising and re-
introducing his satellite bill passed by the House in the last Congress, which
was entitled Communications Satellite Competition and Privatization Act of 1998
(H.R. 1872), is unclear.  We opposed H.R. 1872 because it contained provisions
that, in our view, would have adversely affected our results of operations and
the value of our shareholders' investments in the INTELSAT and Inmarsat
satellite systems. The Clinton Administration opposed H.R. 1872 in testimony
before the Senate Commerce Committee late last year and in hearings on S. 376 in
March of this year.








    
 

                                       19
<PAGE>
 
International Business Conditions
 
     On January 12, 1999, in response to increasing capital flight, the
Brazilian government widened the controlled trading band on its currency, the
Real.  This created an initial devaluation of over 8% compared to the U.S.
Dollar.  As support for the currency continued to diminish, it was apparent that
the Brazilian government needed to allow a "free-float," which occurred shortly
thereafter. As a result, the Brazilian Real devalued 44% as compared to the U.S.
Dollar during the first quarter of 1999, and is no longer tied to a fixed
trading range.  The continued instability of the Real, as well as the current
economic climate within Brazil, are expected to negatively impact growth and
financial performance of International's operations in Brazil during 1999.  In
1998, COMSAT Brazil was International's largest operating company, accounting
for approximately 40% of International's revenues.  Brazil's economic problems
could have a potential "spill-over" effect in other Latin American markets in
which International operates.

Year 2000 Issue (Year 2000 Readiness Disclosure)

     The year 2000 issue stems from existing computer programs that were written
using two digits rather than four digits to define the applicable year (e.g.,
                                                                        ---- 
"99" for 1999).  Some computer programs that have date-sensitive software may
not operate properly when the last two digits become "00," as will occur on
January 1, 2000.  To the extent that this situation exists, there is the
potential for system failure or miscalculations, which could cause a disruption
of operations. The problem is not limited to computer programs, as some computer
and other operational equipment that have date-sensitive processors may not be
able to process dates after December  31, 1999.

     In the second half of 1996, we initiated a program to identify and address
year 2000 issues in order to avoid interruption to our operations at the turn of
the century.  Each of our operating segments, as well as our administrative
functions, have completed the inventory and assessment phases of the year 2000
implementation plan and are currently implementing plans to remediate the non-
compliant systems identified during these first two phases.  We presently
believe that necessary changes to our key computer and other operational systems
and equipment will be completed and tested by the end of the third quarter of
1999.

     Our current estimate is that it will cost approximately $8 million prior to
January 1, 2000 to modify in-house management information systems, customer
products and other systems and equipment affected by the year 2000 issue.  Of
this amount, we have spent $3.6 million, or approximately 45% of the projected
amount, through March 31, 1999. Year 2000 modifications and replacements are
based on management's current expectations and assumptions, which were derived
using assumptions of future events, including the continued availability of
resources and the reliability of third-party modification plans.  Future events
that might cause material differences in management's current expectations and
assumptions include, but are not limited to, the availability and cost of
personnel with appropriate skills, the ability to locate and correct all
relevant computer code, reliance on third parties and similar uncertainties.

                                       20
<PAGE>

     While we are devoting substantial resources to our own year 2000 compliance
 effort, COMSAT, as well as other international telecommunications carriers, 
 will be dependent, in part, on foreign and other third-party 
 telecommunications carriers being year 2000 compliant. The financial impact on
 World Systems and Mobile Communications of foreign or third-party
 telecommunications carriers failing to meet the year 2000 challenge would be
 realized in either of two ways: loss of revenue due to the inability to
 complete the up-link or down-link transmissions to or from a satellite and/or a
 decrease in our share of INTELSAT and Inmarsat operating results. In
 recognition of the potential financial exposure resulting from this dependency
 on foreign and third-party telecommunications carriers, we have undertaken, as
 part of our year 2000 efforts, an analysis of the year 2000 compliance efforts
 of these telecommunications carriers. In addition to this analysis, we are also
 utilizing the results of efforts undertaken by the International
 Telecommunication Union (ITU). We plan to develop contingency plans to deal
 with this issue depending on the results of our analysis and the year 2000
 readiness status of individual telecommunications carriers.

     World Systems derives in excess of 90% of its revenues under long-term
contracts.  Almost all of these revenues are dependent upon termination with a
foreign telecommunication carrier. Even though these long-term contracts are not
subject to termination as a result of the year 2000 issue, a significant portion
of the expected future World Systems revenues and our share of INTELSAT revenues
is generated from services between the United States and areas of the world that
may be subject to service interruptions resulting from year 2000 readiness
issues.  In addition, Mobile Communications derives a significant portion of its
revenues from services either originating or terminating outside of the United
States. If the originating or terminating carrier is unable to initiate or
terminate a call, Mobile Communications, directly and indirectly through our
share of Inmarsat revenues, would be adversely affected by reduced revenues.  It
is not possible for us to accurately quantify the amount, if any, of these
exposures at this time.

     International relies on third-party telecommunications carriers to provide
services to their customers.  We have sought, but have not yet received, final
certification regarding year 2000 compliance from all of our third-party
carriers.  We are developing appropriate contingency plans to mitigate, to the
extent possible, the effects of possible non-compliance by third-party carriers.
 

                        LIQUIDITY AND CAPITAL RESOURCES

     The primary source of cash during the first three months of 1999 was cash
from operations. Our working capital at March 31, 1999 was $39.6 million, a
decrease of $18.6 million from December 31, 1998.  This decrease was primarily
the result of reclassifying to current liabilities the current portion of our
share of INTELSAT's long-term debt and certain other noncurrent liabilities.

     We have access to short-term and long-term financing at favorable rates.
Our current long-term debt ratings are A- from Standard and Poor's and A3 from
Moody's.  Our current commercial paper ratings are A2 from Standard and Poor's
and P2 from Moody's.  Following announcement of the proposed merger with
Lockheed Martin, both Standard and Poor's and Moody's placed their 


                                       21
<PAGE>
ratings on our long-term debt under review for possible downgrades.  The 
downgrades would take effect as a result of merging the corporation with a 
lower-rated parent company.  The ratings for commercial paper are not under 
review at this time. The current ratings on the Monthly Income Preferred 
Securities issued by COMSAT Capital I, L.P. are BBB from Standard and Poor's 
and A3 from Moody's.
 
     Our $200 million commercial paper program had no borrowings outstanding at
March 31, 1999.  A $200 million credit agreement, expiring at the end of 1999,
backs up our commercial paper program.  This credit agreement has a one-year
option to extend its term to December 31, 2000.  We had $36 million remaining
under a $100 million medium-term note program at March 31, 1999.  The medium-
term note program is part of a $200 million debt securities shelf registration
program initiated in 1994.

     Our capital structure and debt-financing activities are regulated by the
FCC.  Under the currently approved FCC guidelines, we are subject to a limit of
$200 million in short-term debt, a maximum long-term debt to total capital ratio
of 45% and an interest coverage ratio of 2.3 to 1. The latter two guidelines are
measured at year end.  We were in compliance with the $200 million short-term
debt limit as of March 31, 1999 with no short-term debt outstanding other than
$29.8 million of current maturities of long-term debt.  We expect to be in
compliance with the other guidelines at December 31, 1999.  If we were to fail
to satisfy one or more of the FCC guidelines, we would be required to seek
advance FCC approval of future financing activities on a case-by-case basis.

 








     



   

                                       22
<PAGE>
 
Item 3.   Quantitative and Qualitative Disclosures About Market Risk

     We do not hold or issue derivative financial instruments.  We finance our
operations and manage our interest rates through a combination of short-term
commercial paper, fixed-rate long-term debt and Monthly Income Preferred
Securities (MIPS) issued by a subsidiary.  The MIPS pay a fixed dividend.
Borrowings under our short-term commercial paper program can expose our
operating results to changes in short-term rates.  At March 31, 1999, no
commercial paper was outstanding.

     The corporation invests its excess cash in highly liquid investments with a
maturity of three months or less.  Such investments can expose our operating
results to changes in short-term rates.

     International conducts its operations primarily through majority-owned and
wholly-owned subsidiaries.  We have financed International's subsidiaries
through capital contributions. International's largest subsidiaries utilize the
local currency as their functional currency. Therefore, fluctuations in exchange
rates relative to the U.S. Dollar are recorded as cumulative translation
adjustments as a component of our stockholders' equity.  Fluctuations in
exchange rates relative to the U.S. Dollar have not had a material impact on our
cash flows or results of operations.









    







    


 

                                       23
<PAGE>
 
PART II.  Other Information

Item 1.   Legal Proceedings
          -----------------
          See note 5 of this Form 10-Q and Item 3 of our 1998 Form 10-K, which
          are incorporated herein by reference.

Item 2.   Change in Securities
          --------------------
          None

Item 3.   Defaults Upon Senior Securities
          -------------------------------
          None

Item 4.   Submission of Matters to a Vote of Security Holders
          ---------------------------------------------------
          None

Item 5.   Other Information
          -----------------
          None

Item 6.   Exhibits and Reports on Form 8-K
          --------------------------------
          (a)  Exhibits
               --------
               27 - Financial Data Schedule

          (b)  Report on Form 8-K
               ------------------
               Report dated February 22, 1999, announcing that our 1999 Annual
               Meeting of Shareholders has been scheduled for June 18, 1999 and
               that, at the request of Lockheed Martin Corporation, the
               Agreement and Plan of Merger among Lockheed Martin Corporation,
               Deneb Corporation, a wholly-owned subsidiary of Lockheed Martin
               Corporation, and COMSAT, dated as of September 18, 1998, will be
               submitted to shareholders for approval at that meeting.




    



    
 

                                       24
<PAGE>
 
                                   SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

                               COMSAT Corporation
                               ------------------



                            By  /s/ Alan G. Korobov
                                --------------------
                                 Alan G. Korobov
                                    Controller


Date: May 17, 1999









    







    


 

                                       25