signed up for AA as a new customer transferred 50K first 25000 points posted
before cycling the 50K i want to know if i should sign up for MR now
or get all AA miles before signing up for MR ?

Would i be able to follow up with delta then ? since MR-Delta works

Also i see MR and delta offers run till 12/31/2011. I think someone in the forums posted is only valid till end of this month sept 2011

Do you guys know when these offers expire ?