Google Earth

It's great for procrastination and time wasting, as long as you have a beefy net connection :
(of course, these references only count for as long as the images don't get updated.

head to Dallas Fort Worth Airport, and look at the westernmost runway

(32 53 21, -97 03 17)

now either it was very busy that day, with identical types of plane, or the satellite actually tracked some planes taking off.

just start with that plane on the runway at the reference above, and go directly north, there'a another one half way along the runway.

Then check the next door runway to the east - the same plane type seen at
32 05 04, -97 03 01 (shadow at 32 55 12, -97 03 15) is also at
32 55 02, -97 03 01 (shadow at 32 55 57, -97 03 20)
32 56 23, -97 03 01 (shadow at 32 56 46, -97 03 25)
then further shadows (but no plane) at
32 57 37, -97 03 29 and 32 58 34, -97 03 36

there's another guy on runway 32C, on the Eastern side of the airport.