Right, boyfriend needs to see his GP and discuss what is causing him to snore, if anything medical is causing it, his daytime sleepiness etc. He should also remember to tell the doctor that the snoring is also affecting you.
As has been said in this thread Snoring affects both sides of the relationship.
It may be useful to get him to do the epworth test, see link post further up this thread, but to be of any use he must answer completely honestly. If the score is high then the GP should be made aware as there is likely to be an underlying condition causing sleep disturbance.
Have fun in AUS, if he snores on the plane just use ear plugs and pretend he's with someone else
but seriously if he drinks alcohol that will make it worse as will sleeping tablets or other similar drugs try to avoid these.