I used to fly in and out of Coventry on private jets very meany years go (like 25 years). One was to/from Genoa and the other was to Pittsburgh via Newark. It was originally hoped that US Immigration would be done at Pittsburgh allowing the flight to go direct, but Pittsburgh stopped doing international arrivals.
It was quicker and easier to get to Genoa this way as there were no direct flights and changing means it took the entire day to get there - rather than a couple of hours. The little jet ended up being like a bus for some people who went out and back several times a week.
The longer journey to Pittsburgh was set up so the Board could say we had a US HQ and that the board was based there when in fact they still lived in the UK and went when needed. I recall (maybe incorrectly) that the Pittsburgh aircraft was actually ordered by an investor of Planet Hollywood, who cancelled at the last minute and the company picked up the order at short notice. The only thing left on the aircraft that gave away its original owner was a small sign above the door which said " I'll be back"