Definition: In the context of aviation, a boarding pass is an identification card issued by an airline or airport to passengers who have checked in for their flight. It serves as an official proof of identity and allows passengers to enter the airport gates and check-in for their flight without having to present any other form of identification. The term "boarding pass" generally refers to the specific type of boarding pass that is issued by a particular airline or airport, such as Delta, American Airlines, United Airlines, or others.