Luggage doesn't matter.Gotta leave the house 2 hours before the 2 hours before your flight. Then board, Then fly. Then disembark.
If flight is noon, you leave the house at 8 to be at the airport for 10. Then security theatre (remove your shoes, you're going to the LaNd Of TeH FrEe!!!).
If you're lucky, you're hailing a cab at JFK at 1:30pm.
That's your "45 minute flight". 6 hours, if you're lucky.
Once you slack, you never go back.