Why specifically Emirates vs. Milton Keynes though? They also played Wembley in 2010 and I think there they had higher attendance than at Emirates Stadium. Also, they played several large stadiums in the US during the American Idiot tour (Giants Stadium, just to name one) also most likely exceeding 60'000, although not reaching 130'000.
Btw, I think Wembley in 2010 was actually their single biggest show in terms of attendance. From what I read, they played in front of 90'000 people, which they haven't topped since then on a single show.