Planning a trip with Delta from Pennsylvania The Delta Airlines Allentown Office is a useful search term for travelers who want details on bookings, flight changes, and baggage rules. Whether you are flying for business or leisure, knowing the basics in advance can make your journey far smoother. First, look over your flight schedule. Be sure you know your departure time for your flight, particularly if you have a layover. Review baggage information so you know what you're permitted to bring on-board and checked baggage to prevent surprise baggage fees. Gather your ID and any necessary travel information, then plan your check-in to prevent any unnecessary hassle. For quick updates, boarding passes and managing your trip, Fly Delta app and Delta.com are very handy.