I'm looking to book a family trip next summer for 4 to Germany and Spain from ORD. I'm using American miles and was hoping to fly Air Berlin one way and Iberia the other to use their lie flat products. I was hoping to fly into one country, and out of the other on the return, whichever would have availability.

However, I know finding 4 premium seats will be next to impossible, especially on Air Berlin flights. I routinely see 3 seats on Iberia, but have yet to see 4. US Air has flights from PHL to MAD on their A330-300 which should be lie flat. Would I be better off just booking that and see if I can change the award ticket if Air Berlin or Iberia space becomes available? Is Air Berlin and Iberia's product much better then the US Air product?