So I just left the Baltimore airport food court where some guy was doing this to me. It was that shy sort of "oh hell she's looking back, look away NOW!" sort of glance away when I would try and catch him looking.
Amusing, flattering, and my girlfriend got a laugh out of it when I told her about it via text.
Also a totally tangential protip: if you're in the Baltimore airport and see that hot dog stand out near the B gates, don't get the "Tucson Sonoran" hotdog. The only two ingredients they get right are a hot dog and beans, the rest is either missing or plain wrong. Tucson should sue for defamation of character.