boxed lunch sold at airports
A specific type of 駅弁 (station bento) sold at airports, often featuring local specialties.
See also: 駅弁
出張の前に空弁を買って飛行機の中で食べた。
Before my business trip, I bought an airport bento and ate it on the plane.
A portmanteau of 空港 (airport) and 弁当 (boxed lunch), modeled after 駅弁 (station bento).