After leaving the TWA hotel, I make my way back to JFK Terminal 4 which is where Singapore Airlines flies out of. With some time to kill, and being in New York, I figure a visit to Shake Shack is in order. While not wanting to ruin my appetite for the flight I end up snacking on fries before doing a few laps of the terminal to stretch my legs. Typically, I would spend some time in a lounge prior...