I'm flying from EWR to MIA on the 6th of June on AA2125, however everytime I try and view the seatmap on aa.com, it comes up as saying it's unavailable. The previous day and the following day's flights show up fine, as do all of the other MIA flights that day. I'm just curious as to why it wouldn't appear - an equipment change perhaps?

On a related note, I'm a BA Silver (OW Sapphire), is it possible to get the same seat selections as a AA Plat would be entitled to (if I can get the seatmap up first!)? Presumably I'd have to contact AAdvantage to do that?

Lastly, a few days later I'm travelling from Key West (EYW) on to Miami, connecting to the BA208 back to London. They are ticketed separately with two hours between the two flights at MIA. Will AA be able to check the bags all the way through to London? Will we need to go through security again at Miami, or remain airside throughout?

Thanks!