Originally Posted by
ByrdluvsAWACO
AB's membership in OW has nothing to do with the opening of the airport.
You will rarely see a hard date for airline membership into any alliance. The usual press releases will state a certain time frame like 1Q, 1H, or early/mid/late 201x.
Every article I read about AB's entry mentions early or April 2012. Even AB's site says at the start of 2012.
April was the date for the new Berlin airport planed opening but it was delayed to May and then June.
If you read the OneWorld press release on AB joining the alliance carefully you would be able to trace the origin that the AB joining date is very closely connected with the airport opening. Ideally AB hoped that new airport would have all signatures of AB with OneWorld logos ready to use.