Each airline's boarding pass has a different design, but the basics are all there. Your seat number, departure time, airline and flight number, frequent flyer number, and class of service are all standard practices to provide the information travelers and airline staff need. A lot of that is stored within a scannable bar code. The first thing that most travelers look for when handed their boarding pass, though, is their seat assignment.
Delta's basic economy ticket cost $175 and included one carry-on bag, but did not accrue miles or allow for seat reservation. A switch to an emptier flight was made at the gate.