49 C.F.R. § 38.161 Moveable aisle armrests.
Title 49 - Transportation
A minimum of 50% of aisle seats, including all moveable or removable seats at wheelchair or mobility aide securement locations, shall have an armrest on the aisle side which can be raised, removed, or retracted to permit easy entry or exit. [63 FR 51700, 51703, Sept. 28, 1998]
Title 49: Transportation
PART 38—AMERICANS WITH DISABILITIES ACT (ADA) ACCESSIBILITY SPECIFICATIONS FOR TRANSPORTATION VEHICLES
Subpart G—Over-the-Road Buses and Systems
§ 38.161 Moveable aisle armrests.