Seniority in MON only counts for the A330 and soon 767. These are flown by the senior A320/1 and 757 crews respectively. The A300's operate a mix of long haul and short haul but more long haul in the winter. Most of the A300 long haul is via Bahrain, and this is where most of the crews slip (also some in Goa this year). Salary is the same for all fleets. Bidding for type changes only happens if it is convenient for the company. A300 crews are based predominantly at LGW and MAN although a few are still LTN based (unlikely that any more will be based at LTN). The A330 trips are variable, the winter has week long Male trips, bullet Goa's and two or three day Calgary's amongst others. In the summer expect Orlando (bullets or a few days) and in years gone by lots of Cuba trips. The A330 probably has the best mix of short and long haul but as has been said you will have to do your time on the A320/A321 first. Recruitment is on to all fleets depending on requirements. The majority this year and probably in future years will be A320/A321. Hope this helps.