Zerotohero. What you get offered in your offer letter and what you get may be 2 different things. Read the offer and it will say that at any time, then can switch your fleet allocation due to demands at the time, so if they offered you 330 or 777 and then they switch you to 320 after you get here, don't say you did not know this could happen. Its happened in the past. Some came for the 777 and got switched to the 330 or 320. Some came for the 320 and got switched to the 330. Best thing for you to do is if its going to be a big deal, don't except the job and let someone else take your place that would be happy to come here and fly and of the aircraft Qatar Airways operate.
Well done to all those who have been offered start dates and look forward to seeing you here in Doha.
FMSPEED get your application in as its true.