This is a list of airports where motorcycle parking is practiced and tolerated, even if not officially condoned.

OPO - It's supposed to be for employees only, but there are no checks or signs at the motorcycle parking area. If you want to try it, go the entire length of the terminal, then keep right, and turn right at the first opportunity into P11 "Funcionários - Staff". Go around the short gate arm, then turn right, riding under the building to the very end until you reach the glass wall of the arrivals building. Hop the curb, and bikes and scooters park along the glass wall, to the left as you look towards the building. See post #23.

SEA - There are two motorcycle parking areas intended for employees, but there are no signs that this is for employee only and no reports of enforcement against non-employee parking. Area 1: Follow signs for "arriving passengers", stay in the far left lane and make the left right under the Toyota billboard. Park near the other bikes, near the taxis and hotel shuttles. Area 2: pretend you're a rental car shuttle but instead of turning at the billboard, continue all the way through the shuttle and taxi stop area. The parking area is on the right at the end. The lettering on the pavement at the second area does say "employee motorcycles" but there are no stories of it being enforced. Area 2 is larger and more convenient to airlines farther south.

SFO - Go to Long Term Parking. Two lights before the garage entrance, ride up on to the sidewalk and into the fenced employee long term parking. Go to the end of the fence and there is a somewhat sheltered designated motorcycle parking space (about 12 spots). Exit the same way.

SNA - Motorcycle parking spaces inside the parking deck, next to the elevator. Although no signs are posted, it seems that local practice is to enter at the left side lower parking lot, passing between the yellow posts. To exit, go towards the exit pay booths, and there is a space for bikes to pass without paying. Although no signs are posted saying that this is free, the practice is common and not challenged by the parking attendants at the exit booths or the OC Sheriff.

YUL - Unconfirmed internet story of free designated motorcycle parking area adjacent to the parking attendant's booth of the Marriott HotelParc.