Comment by RankingMember

Yep! The interface icons are a little cryptic, but if you click the little icon in the upper right that looks like a play button surrounded by a reversing arrow, that will bring up an interface at the bottom to specify the date and time you want to see the history for. Click the "pause/unpause" button and it'll play back the activity at the speed you set so you can see all the planes that overflew at that time.

I would venture that once you had this reference to look up, you will be able to start identifying the planes by sound alone. Lots of grease monkeys can ID a car by its sound. Some are more obvious than others. I can easily tell when the dual rotor Chinook flies over compared to other helicopters.