If the starting line is in Philadelphia as speculated, this are the possible international flights.
Amsterdam, Aruba, Barcelona, Bermuda, Brussels, Cancún, London-Heathrow, Montego Bay, Munich, Nassau, Punta Cana, Rome–Fiumicino, San Juan, Santo Domingo–Las Américas, St. Maarten, Tel Aviv–Ben Gurion, Toronto–Pearson and Zürich