asked the Secretary of State for Trade what is the maximum number of passengers currently being carried annually by a single-runway international airport.

Gatwick airport is currently the busiest single runway international airport having handled 8·7 million passengers in 1979. Palma airport's single runway also handled over 8 million passengers in the same year. At Washington national airport, only one runway is normally used for air transport traffic and in 1979 the airport handled 14·3 million passengers.

asked the Secretary of State for Trade what is the minimum interval between aircraft movements required at international airports for aircraft designed to carry (a) up to 200 passengers (b) up to 300 passengers and (c) up to 400 passengers.

I shall reply to my hon. Friend as soon as possible.