It has to be a 747 or an rather and A330
I think the Germans use the A310, the French the A319 / A320 as do the Italians. A 500 seater seems rather grand for the world we live in.
The Japanses have two B747s a bit like the US. Even New Zealand have the B757 and they don't even have fighters any more.
An immaculate RAF A320 would be the right signal for Britain as much of it is British made and we're not showing like some tinpot with their own fleet of A340s and B744s.