Not in the NOTABLES from last bread-
The PLANE landed at JFK FROM SFO. It's not about the flight to LAX- it's about where the flight CAME FROM. This plane goes SFO-JFK-LAX.
Opposite. It is the flight INTO JFK that is FROM SFO before LAX.
Flight 1516 is JetBlue from SFO to JFK. It is the SAME PLANE that turns around 12 hours alter and is Flight 1623 from JFK to LAX.