121.95—Route width.
(a)
Approved routes and route segments over U.S. Federal airways or foreign airways (and advisory routes in the case of certificate holders conducting flag operations) have a width equal to the designated width of those airways or routes. Whenever the Administrator finds it necessary to determine the width of other approved routes, he considers the following:
(b)
Any route widths of other approved routes determined by the Administrator are specified in the certificate holder's operations specifications.