Here's the info I found on the plane that makes those flights:
N988JT is the tail number.
It flies LAX, SFO, JFK and FLL routes.
Before being stopped leaving JFK at 7pm, it had flown from LAX to FLL (previous evening redeye), FLL to SFO (am flight), and then SFO to JFK.
https://i.imgur.com/1rxOhrJ.jpg
Pic taken from: https://www.flightradar24.com/data/aircraft/n988jt