Here is a pic from Oct 1967 where you can see the public enclosure next to the terminal building which opened in May 1966. The young lad in the pic above could easily have been me (but isn't
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Hangar 89 was built in 1969 by Tarmac Construction at a cost of £600,000. It is still owned by Luton Borough Council (or whatever they are called this week) and was leased to Britannia and later easyJet.