The question of taking animals abroad by air has come up several times on this forum.
You might like to have a look at this thread:
http://www.pprune.org/forums/showthread.php?t=157900.
Part of my reply is copied below, as it may help you and your friend.
"So far as taking the dog foreign is concerned, you may not. You may only use approved carriers and routes. Carriage of animals on private aircraft or boats is specifically forbidden. The link to the DEFRA (formerly the Ministry of Ag and Fish) website is
http://www.defra.gov.uk/animalh/quar...nfo/routes.htm
General advice on the Pets Travel Scheme is at http://www.defra.gov.uk/animalh/quarantine/pets/"
Last time I looked, there were very few approved carriers to any destination.