Instead, it needs to be applied to the boarding pass each time you buy a ticket. Adding the KTN to your Delta app makes booking a flight and planning for your trips that much easier, as you don't ...

Smart bookings Delta has also updated its Fly Delta iPhone app to integrate with Apple?s Passbook. Consumers can now add their boarding pass to Passbook, which can be scanned at the airport?s gate.

The person, who has not been named, was able to board a Delta flight set to travel from Seattle-Tacoma International Airport to Honolulu Tuesday without a boarding pass. The unticketed passenger ...