I use the following Airport Monitor for La Guardia airport:
When you click on the planes, it tells you what kind of plane it is, but there are some codes for the planes that I dont know what they are, like:
Can anyone give me ideas what what planes these might be?
Also, often these things give plane types for aircraft that are certainly helicopters, judging by their activities. I doubt that was truly a 757 doing circles over Randalls Island at 800 feet for an hour.