§ Mr. Foulkes
To ask the Secretary of State for Defence what are the criteria used to assess whether an advisory route class F airspace should be upgraded to an airway class A airspace; and if he will list all such advisory routes which have been so upgraded in the last five years. 
§ Mr. Norris
I have been asked to reply.
The Civil Aviation Authority is responsible for airspace planning. I understand that the CAA would consider upgrading an advisory route, class F airspace, to an airway, class A airspace. if there were more than 10,000 air transport movements a year on that route. During the last five years. there have been no advisory routes upgraded to an airway.