British Airways used to operate an all-business class Airbus A318 from London City Airport to New York - it was pretty short. :)
So was Pan Am’s Yankee CLipper:
https://www.centennialofflight.net/essay/Commercial_Aviation/atlantic_route/Tran4.htm#:~:text=With%20increased%20confidence%20in%20its,way%20trip%20across%20the%20ocean.