What aircraft were there at that time?

To answer my own question from last year, this service is available in FlightRadar24 (Playback icon at the bottom) and Plane Finder (Playback icon in the upper-right).

The history is available for free for 7 days and 14 days respectively. If feeding them, history is available for 3 years from each.

Comparing the two, I have found FlightRadar24’s data to be more accurate and complete overall.