TAP Portugal, founded 1945 as Transportes Aéreos Portugueses, SGPS, S.A., commonly known as TAP, is the national airline of Portugal. TAP Portugal is 100% state owned and and has been a member of the Star Alliance since 2005. Its hub in Lisbon is a key European gateway.
TAP’s regional subsidiary carrier is Portugalia Airlines.
TAP originally meant Transportes Aéreos Portugueses (Portuguese Air Transportations). This was dropped in 1979 when the company changed its name to TAP Air Portugal, then dropped again to its current operational name, TAP Portugal in 2005.
Source: Wikipedia