Question: Where is the head office of a Portuguese regional airline that is a subsidiary of TAP Portugal and operates scheduled international and domestic services from its bases at Lisbon Airport and Porto Airport on behalf of a Portuguese regional airline brand name for TAP Portugal which operate short- and medium-haul routes ?
Sentence (from "TAP Air Portugal"): TAP Air Portugal is the flag carrier airline of Portugal, headquartered at Lisbon Airport which also serves as its hub.
Relevant evidence: No