Q. Airline industry

Business Source Ultimate: Select "Industry profiles" from the browse option and perform search under "Airlines". 

Passport: Select the menu search and search under "Airlines".

MarketLine: Search under "Airlines".

Factiva: Click on "Companies/Markets" and select "Industry". Browse and select Air Transport and/or Airlines.

Use RITA and TranStats, both from the Bureau of Transportation Statistics, to find a tremendous amount of data.

Airlines for America

For EU data go to Eurostat - Air Transport Statistics

For data on Spain go to INE. See also Ministerio de Transportes, Movilidad y Agenda Urbana.