The Air Navigation (Fourth Amendment) Order 1973
At the Court at Sandringham, the 19th day of January 1973 Present, The Queen's Most Excellent Majesty in Council

Her Majesty, in exercise of the powers conferred on Her by sections 8, 57 and 59 of the Civil Aviation Act 1949(a) and of all other powers enabling Her in that behalf, is pleased, by and with the advice of Her Privy Council, to order, and it is hereby ordered, as follows: