Tfl has analysed the airspace consequences of all the options, whether LHR, LGW or ITE and has informed Davis of its views. The material will eventually make its way into the public domain if not already. Each of the options is being analysed by each of the parties so that all the pros and cons including airspace can be identified and considered advice submitted to Davis.
Airspace is not a show stopper for any of the short listed options, even NATS has said so in its formal submission.