FAA circular updated

f.
Operators Prohibiting CRS Use. No aircraft operator may prohibit a child from using an approved CRS when the parent/guardian purchases a seat for the child. If an approved CRS, for which a ticket has been purchased, does not fit in a particular seat on the aircraft, the aircraft operator has the responsibility to accommodate the CRS in another seat in the same class of service. The regulations also permit an aircraft operator to use its discretion in identifying the most appropriate forward-facing passenger seat location, considering safe operating practices. For example:
(1)
A CRS with a base that is too wide to fit properly in a seat with rigid armrests can be moved to a seat with moveable armrests that can be raised to accommodate the CRS.
(2)
An aft-facing CRS that can not be installed properly, because of minimal pitch (distance between seats) between rows, can be moved to a bulkhead seat or a seat in a row with additional pitch.
(3)
A harness type CRS (approved under § 21.305(d)) with an upper strap unable to encircle some sleeper seats, or very large first class seats, can be moved to another seat that can accommodate the strap.
NOTE: An aircraft operator may have policies, based on safe operating practices, that establish certain seat locations for passengers who use a CRS on a specific aircraft. However, prohibiting the use of a CRS (if a ticket has been purchased), when there are seats on the aircraft where the CRS could be used

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