So at the time the A350 didn't exist so I will list the aircraft not including the A350. So it goes A300, A310, A318, A319, A320, A320, A321, A330, A340 then it skips to the A380. So why did Airbus skip a few numbers?
The question of aircraft name variants have already been discussed, but I just want to add that other reasons have also been proposed:
- The '8' in the 380 resembles the double decker configuration of A380.
- It was named A380 because it is twice the size of A340
- And of course, it is the lucky number for Chinese.