I applied for two Citi cards last month because I switched my banking to Citi, have a huge amount of travel coming up (Prestige), and received a mailer for an AAdvantage card that had a Dec. 31 expiration.
Also, if AT&T doesn't care, it should. AT&T sure as hell doesn't turn away customers who opened two other accounts within the past 65 days; it shouldn't want its store-card issuer doing so, either.