Hmmm . . . prime need for getting the tail in for servicing: the folding fin.
One of no the most convincing, UFO story I've ever seen was an BOAC Stratocruiser's captain, crew and some passengers seeing an object with orbiting satellites that IIRC went inside the 'mother ship'. My words. I've kept the article for decades but put somewhere in the last move. It was published in a science magazine but the only Google I can find now is the one that looks more than a tad schoolboyish.
There is Pathe news interviewing the crew which I hadn't seen until c 2012 I recall the captains saying far from being frightening, it gave a feeling of wellbeing.