I found the Sennheiser HMC ANR had quite a clamping effect around the head after a couple of hours. Bose-X and DC are a little large for the jet environment and don't allow one-ear-off use.
Many of my colleagues use the Plantronics MS30-2 StarSet; I've just ordered one from the States. Google and you will find. Be sure to order the one with the two jack-plugs as they come with a single plug as standard.