Pilots will typically get cards that match up with the type of planes they fly (although they can also hand out cards from other planes), and they are free to give them away to any customer who asks.

You can now ask any Delta pilot for a Centennial-themed trading card on your next flight. There were over 5 million of these cards printed. ATLANTA - Remember when aircraft trading cards went viral?

SALT LAKE CITY (KTVX) — Trading card collectors and aviation fanatics will soon have an exclusive set of cards to begin collecting on Delta Air Lines flights this year. As part of its centennial ...