US Patent # 6,159,119 - Shimano

US Patent 6,159,119 - Shimano AirLines main image

Contrary to the prevailing marketing myth, it appears that Airlines may have been originally envisaged as a triple system for cross-country use, including a front derailleur and a long arm rear derailleur.

Browse associated derailleurs.

Shimano Airlines derailleur (AR01) thumbnail