I think you're right. No in-cabin pet travel on international flights.
I'm really not sure at the moment because some of the Airlines I've looked at have said yes and some have said no. >.< I'm going to worry about it later when it gets closer to his flight which isn't until Dec. However I did find this so I'll try to do more research.
NWA"United Kingdom (U.K.) regulations do not permit carry-on pets or accompanied pets traveling with passenger luggage. All animals, including service animals, must be transported using the cargo service.
Northwest welcomes pet dogs, cats and ferrets traveling with their owners on non-stop flights from the U.S. to London-Gatwick under provisions of the U.K. Pet Travel Scheme (PETS). Pets that meet the rules of this program can travel as cargo from the U.S. or Canada to the U.K. without having to undergo the six (6) months quarantine."
Then they also have
this."From September 15, 2003 onwards, Northwest Airlines will accept pet dogs and cats traveling with their owners from either Detroit or Minneapolis/St. Paul direct to London-Gatwick under the provisions of the U.K. Pet Travel Scheme (PETS).Pets that meet the rules of this program can travel to the U.K. from the U.S. without having to undergo 6 months quarantine."
But then there are REALLY WEIRD sounding airlines like
Swiss that make you wonder if they make it up as they go along.
"Take your special companion along with you when you travel. With SWISS, your pet can travel on all flights to any destination of our network either right next to you in the cabin or in cabin-like conditions in the baggage compartment of the aircraft.
Please note that air transportation of animals is subject to a number of regulations which can differ considerably from one country to the next.
All necessary documents must be provided in the original, such as: export, import, and transit permits, health or vaccination certificates. Your animal must be booked in advance."
In the BAGGAGE COMPARTMENT?! WHAT?! O.O Are they crazy?!
So with all that there's one last option that I can see which I got from DEFRA about flying your pet over. They have a list
here of different airlines as well as a lot of private jets. It may cost more but you wouldn't have to put your pet in cargo. I'm going to just have to think about it later. It really upsets me at the moment to be having to get him micro chipped, I have no idea how to react to him having to fly in a cargo hold.