airliners.net

"a.net" as the groupies call it has a nice search engine that lets you specify airline, airport, airplane type, and other variables. So if you want Icelandair taxiing their only 757-300 (and worldwide, a very rare plane cause it's the special limousine-stretch version of the normal 757-200) in BOS, you got it.

In fact, I've got it right here.

Here is Snorri taking off at KEF.