AMS - FREE designated covered motorcycle parking by the control tower (link, coords N52.30721 E4.76298). Adjacent to the Privium parking deck.

BDA - FREE designated scooter/cycle parking area
Between the departures and arrivals halls, an area with dozens of free designated spaces. Must park within the lines and in a designated space. Parking outside the lines or in a car space will most definitely result in a ticket.

BRS - FREE [official link]

BRU - FREE camera-monitored parking facilities for motorcycles
On coach park P15a on level 0

CPH - FREE. From their website "Naturally, we offer free parking for your bicycle or motorcycle at Copenhagen Airport when you traveling". Naturally. Per the map, motorcycle parking is in P4.

DSM - FREE designated motorcycle parking area, new location as of April 2012, east side of long term surface lot. Take Cowles Drive and follow signs to motorcycle parking.

DTW - FREE, officially-sanctioned motorcycle parking in the garage at the McNamara terminal.

EWR - FREE covered motorcycle parking at the entrance of parking deck P4 (about 20 spaces). Follow signs for P4. Park just outside the gate in designated motorcycle parking area. Take AirTrain to the terminals.

FCO - Designated covered motorcycle parking in Parking Deck E. Rates for motorcycles are 10-14€/day, as opposed to 24-30€/day for cars. Free helmet check too.

GVA - FREE partially covered spaces for motorised two-wheeled vehicles near the P2 arrivals car park. link

HEL - FREE bike parking under Terminal 2's drop-off ramp on the ground level

HNL - Five PAID locations, with lower rates for motorcycles than cars ($1/2hrs, $5/day, $50/month) link

IAH - FREE, covered, walk to terminal. IAH has a place in Terminal A. Once you are in the A/B loop, past terminal B come around A, and just after the pickup for arrivals, on the left there is a sidewalk into an official motorcycle parking. Into the terminal straight past the pay booths, and down the hall up the escalator come out by spirit/westjet. Come out the way you came in. Inter terminal train available before or after security. Never had a problem, left the keys in the bike once

JFK - FREE uncovered motorcycle parking by the kiss-and-fly by Lefferts Blvd (AirTrain station B). Follow signs for Long Term Parking, then Valet Parking, then Kiss-and-Fly. Locations shown on official parking map. Motorcycle spaces are specifically designated. Take AirTrain to the terminals.

LAX - FREE parking inside the Central Terminal Area parking structures. Officially sanctioned. When entering, drive carefully around the entrance gate arm and DO NOT take a ticket. Do not park in a space for a car. A motorcycle may be parked at the ends of rows, in corners, and in other spaces provided it does not block access to parked vehicles, handicapped spaces, Smarte Carte machines, passenger traffic, paths for the disabled, automobile traffic, doors, elevators, driveways, etc. When exiting, drive carefully around the exit gate arms.

LCY - FREE motorcycle parking opposite Avis, in front of the terminal.

LGA - FREE designated motorcycle parking (10 spaces). Follow signs to the Marine Air Terminal A, parking lot P7. Look for the motorcycle parking spaces outside the P7 fence just off Fiorello Lane, adjacent the P7 toll booth exit lane. Walk to the Marine Air Terminal for Delta Shuttle flights, or take a shuttle bus to the other terminals.

LGW - FREE parking for motorcycles in designated motorcycle spaces in South Temrinal (car park 2) and North Terminal. Motorcycles must NOT park in car spaces, only in motorcycle spaces.

LHR - FREE designated motorcycle parking at all terminals. For T1/T2/T3, behind Short Stay Car Park 1A/5, to the right of the exit. For T4, opposite the arrivals forecourt. For T5, on arrivals level, behind the Short Stay Car Park (follow signs for the Sofitel, pass the Sofitel, then turn right, and the motorcycle parking will be on the left).

LIN - Two designated covered motorcycle areas, in Parking Decks P1 and P2. Rates are about 1/4 of the rates for cars.

LIS - Free designated motorcycle parking in lot P3.

MCM - As you come to the end of Avenue des Ligures, instead of making the U-turn at the end just continue straight between the pylons to the right of the orange building. Park there.

MKE - FREE covered motorcycle parking area located at the north end of baggage claim drive (by baggage claim #5 ), perhaps as a nod to HD.

MSN - Officially free. Go toward the parking ramp entrance; use the far right lane and squeak by the gate. Parking is immediately on the right as you enter the parking ramp; motorcycle spaces are striped. Ignore the "hourly parking only / no parking 2am-5am" signs--they're left over from when those were car spaces. Exit via the small path labeled "Motorcycle Exit Only" about halfway down the same aisle you came in.

NAP - Designated uncovered motorcycle parking as you approach T1, just after the premium parking lot P2. 1€/hours or 7€/day, as opposed to 4€/hour or 29€/day for cars in the adjacent premium parking P2.

NCE - FREE Outdoor fenced parking next to Terminal 2, with parking for 500 bikes in marked spaces. Not great signage, but entrance is on the right before you get to T2, at N43.65865 E007.20329 link

PDX - FREE motorcycle parking on the arrivals level under the upper roadway. Walk to the terminal. link

SFO - Try Ace Parking. 401 East Milbrae Ave, Milbrae (Aloft Hotel). You can park your bike on unused space (not regular parking spaces) and pay just $5+tax per day.

SIN - Hundreds of designated motorcycle spaces in the Car Parks at all three terminals. Motorcycle rates are $1.30 per day, as opposed to $20/day for cars.