1950 Green One, Europes first airway opens, running from Woodley near Reading to Strumble Head on the Welsh coast.
1951 Five new airways created: Amber One Daventry-Dunsfold-Dieppe-Paris; Amber Two Daventry-Brookmans Park-Maidstone-Paris; Blue One Woburn-Watford-Crowborough; Red One Dunsfold-Maidstone-North Foreland-Amsterdam; and Red Two Woodley-Epsom-Ashford.
(From the NATS website)