asked the Secretary of State for Air the number of aeroplanes belonging to the Royal Air Force in which the pilots' cockpit is enclosed in safety glass?

The pilot's cockpit in Service aircraft is not closed in, but is protected by a windscreen of safety glass. Enclosed cockpits are now, however, under experiment, and in these safety glass is being employed.

Can the Under-Secretary say whether they are also experimenting with wind screen wipers?

I should like notice of that question.

May I ask whether this glass is being used in air liners?

I believe it is being used already.