Thanks for compiling.
ELM - No mention of it on the website, but there are reports from 2008 of motorcycle parking and a bicycle rack being built in front of the terminal. Can anyone confirm?
GVA - FREE partially covered spaces for motorised two-wheeled vehicles near the P2 arrivals car park.
MKE - FREE covered motorcycle parking area located at the north end of baggage claim drive, perhaps as a nod to HD.
IAD is one of those airports where parking in a regular car space is permitted, but the automated gates will not open for a motorcycle (and there is not enough space to maneuver around). I tried and failed at daily garage 1, then tried and failed again at daily garage 2, but the exit gate at garage 2 was a attended and the attendant saw me and ran over to give me a ticket (at regular car rates, of course).