A380 fare: $818-$24,538

That's the price range on Qantas going roundtrip between L.A. and Sydney - and it's reflective of the differences on board the world's largest passenger jet. Coach passengers should expect the usual cramped quarters (typically 10 across on the lower deck and eight abreast on the narrower upper deck); first-class passengers get their own little compartment with high-tech everything. Whatever the cabin, the A380 is proving popular on all the airlines that have them. From the WSJ:

One unique A380 coach advantage: The side walls of the lower deck bow out, instead of in, so shoulder room for people in window seats is spacious. The tight quarters haven't deterred customers, who find the quiet cabin, staircases between the decks, camera views of the airplane, seat-back entertainment systems with big screens and more options, and the buzz of the unique airplane to all be reasons to prefer A380 tickets over other planes.

Photo: First class accommodations on Qantas A380.