if you mean the instrumental that sounds like it was composed in the 1950s -
The ad was designed to hark back to the glamour days of air travel. The music sounds like several tunes from the era, including Henry Mancini's "Lujon" (to which it has been compared), but according to the Inter-active Marketing & Advertising Awards 2004, http://www.nma.co.uk/imaawards04/Travel.aspx
the music was specially commissioned for the ad.