A few of them are: LufthansaSingapore AirlinesAir FranceEmiratesQantasBritish Airways
The newest and biggest passenger airplane so far.it is a four engined double decker passenger plane
Quite abvious: the A380 is much bigger, weights almost three times the A300. Also, the A380 has four engines ins tead of two and has two decks instead of just on one for the A300.
The A-380 cruises around Mach .85 or around 550mph. Most airliners have roughly the same cruise speed.
advantages of airbus A380