From Longman Dictionary of Contemporary Englishboarding passˈboarding pass (also boarding card British English) noun [countable] TTAan official card that you have to show before you get onto a plane
Examples from the Corpus
boarding pass• At the airport, they provide that number along with photo identification to receive a boarding pass.• You will have to see him Patel was handed his boarding pass.• He gestured to me to push my way up to the front and then pressed a precious boarding pass into my hand. 