SCHEDULE 14A
                                (RULE 14A-101)

                    INFORMATION REQUIRED IN PROXY STATEMENT
                           SCHEDULE 14A INFORMATION

          Proxy Statement Pursuant to Section 14(a) of the Securities
                             Exchange Act of 1934
                               (Amendment No.  )

Filed by the Registrant /X/

Filed by a Party other than the Registrant /_/

Check the appropriate box:
/_/  Preliminary Proxy Statement
/_/  Confidential, for Use of the Commission (as permitted by Rule
     14a-6(e)(2))
/_/  Definitive Proxy Statement
/X/  Definitive Additional Materials
/_/  Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12

                             FRONTIER CORPORATION
- -----------------------------------------------------------------------------
               (Name of Registrant as Specified in its Charter)
- -----------------------------------------------------------------------------
   (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):
/_/  No Fee required
/_/  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
     (1)    Title of each class of securities to which transaction applies:
     (2)    Aggregate number of securities to which transaction applies:     .
     (3)    Per unit price or other underlying value of transaction computed
            pursuant to Exchange Act Rule 0-11 (set forth the amount on which
            the filing fee is calculated and state how it was determined): $
     (4)    Proposed maximum aggregate value of transaction: $
     (5)    Total fee paid: $
/X/  Fee paid previously with preliminary materials.
/_/  Check box if any part of the fee is offset as provided by Exchange Act
     Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
     paid previously.  Identify the previous filing by registration statement
     number, or the Form or Schedule and the date of its filing.
     (1)    Amount Previously Paid: $
     (2)    Form, Schedule or Registration Statement No.:
     (3)    Filing Party:
     (4)    Date Filed:


                             FRONTIER CORPORATION
                           180 South Clinton Avenue
                        Rochester, New York 14646-0700


                                                               August 26, 1999


Dear Fellow Shareholder:

We  have previously  sent to  you proxy  material for  the Special  Meeting of
Frontier  Corporation  to be  held  on  September 23,  1999.    Your Board  of
Directors  has  unanimously recommended  that  shareholders  vote in  favor of
adopting the merger agreement with Global Crossing.

Since  adoption  of  the  merger agreement  requires  an  affirmative vote  by
holders of two-thirds of the  outstanding stock, not voting will have the same
effect as  a vote against  the merger agreement.   Your vote is  important, no
matter how many  or how  few shares  you may  own.   Whether or  not you  have
already done  so, please sign, date  and return the enclosed  proxy card today
in the envelope provided.

Very truly yours,


/s/ Joseph P. Clayton
- ------------------------------
Joseph P. Clayton
Chief Executive Officer


                             MAKE YOUR VOTE COUNT!

 Frontier Corporation has made telephone and internet voting available to its
   registered shareholders, and many banks and brokers have also made these
       options available to their clients holding shares in Frontier.

                          We urge you to vote today!
       Simply follow the easy instructions shown on the enclosed proxy.
           If you have any questions about how to vote your shares,
       please call the firm assisting us in the solicitation of proxies:

                          INNISFREE M&A INCORPORATED
                         TOLL-FREE at 1-888-750-5835.