Only once did I land on #23. It was in a Viscount from IOM. Given that:
- I did not start going to the IOM until 1980 or 81.
- The Viscounts were used by Manx (the original!) through most of the 1980s
- The inagural trip of the Manx 146 G-MIMA was in Dec 1987 (I happened to be on it by chance!)
- We can say that #23 was in operation until 'sometime' in the mid 1980s.