Latest forecast which does not take account of aspirational part time bids is LHR and LGW A320 DEP for 2017. LH looks like it has enough bids to supply from internal applications. Most junior is 3500 for P2 777 and 3000 for P2 787 so that is about 5-6 years service. There are no forecast commands on A320 other than gatwick but that's bounced to normal levels of around 2300. Joining SH with a view of a quick command is probably going to disappoint. The LH P2 seniority levels would suggest it goes down to unfrozen levels so that could mean there could be DEP onto LH due to frozen bids. It's worth noting however unlike the A320 which was tagged as DEP the LH fleets just have a seniority number along side. It's not a clear cut answer but that's as much info as anyone has and should help people decide. My two pence, if I were swimming and got offered SH I would not be so bold as to turn it down to wait for LH.