EXHIBIT 18
JOINT FILING AGREEMENT
The undersigned hereby acknowledge and agree that any amendment
to the Schedule 13D, relating to the Class A common stock, par value $0.02
per share, of XO Communications, Inc., on or after the date as of which
this joint filing agreement is made, is and will be filed jointly by the
undersigned with the Securities and Exchange Commission pursuant to Rule
13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, on
behalf of each such person. The undersigned acknowledge that each shall be
responsible for the timely filing of such amendments, and for the
completeness and accuracy of the information concerning it contained
therein, but shall not be responsible for the completeness and accuracy of
the information concerning the others, except to the extent that it knows
or has reason to believe that such information is inaccurate.
This Agreement may be executed in counterparts and each of such
counterparts taken together shall constitute one and the same instrument.
Dated: May 1, 2001
FORSTMANN LITTLE & CO.
SUBORDINATED DEBT AND EQUITY
MANAGEMENT BUYOUT PARTNERSHIP-VII, L.P.
By: FLC XXXIII Partnership
its general partner
By: /s/ Xxxxxxx X. Xxxxxxxx
----------------------------------
Xxxxxxx X. Xxxxxxxx,
a general partner
FORSTMANN LITTLE & CO. EQUITY
PARTNERSHIP-VI, L.P.
By: FLC XXXII Partnership, L.P.
its general partner
By: /s/ Xxxxxxx X. Xxxxxxxx
----------------------------------
Xxxxxxx X. Xxxxxxxx,
a general partner
FL FUND, L.P.
By: FLC XXXI Partnership, L.P.
its general partner
By: FLC XXIX Partnership, L.P.
a general partner
By: /s/ Xxxxxxx X. Xxxxxxxx
-----------------------------
Xxxxxxx X. Xxxxxxxx,
a general partner
/s/ Xxxxxxxx X. Xxxxxxxxx
-----------------------------
Xxxxxxxx X. Xxxxxxxxx
