Pan Pacific was a fictional airline seen briefly in "Two for the Road". The airline operated a service between LAX and Sydney, Australia. It was Pan Pacific that presumably took Christian Shephard and Ana Lucia to Australia.
The Pan Pacific logo was seen behind the LAX checkpoint where Ana was working security. It appeared again in the airline bar where Ana Lucia and Christian were talking to each other. The Pan Pacific logo was briefly seen on a poster in LAX checkpoint where the passengers of Ajira Flight 316 were being checked in, in the episode, 316.