The Flying Stool
I would be careful, Thomas Cook UK had 80ish aircraft, similar to Jet2 and while they were multinational,Jet2 are currently £0.9 Billion in the red. The good news is the Amber list is now open, of course individual countries may yet decide to restrict UK tourists, that will remain to be seen. But this summer is a washout. It will be a tough ride ahead.
I do admire your optimism about visiting Boeing and Airbus, but as you say its a rumour