Answer the following question: Capital Airlines was an airline serving the eastern United States that merged into United Airlines in 1961. Their primary hubs were National Airport near Washington D.C. and Allegheny County Airport near Pittsburgh. In the 1950s they were the largest US domestic carrier by passenger count (and sometimes by passenger-miles) after the Big Four (American United TWA and Eastern). Their headquarters was in Washington D.C. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Answer:
Company