Originally Posted by
mecabq
Not only a one-letter difference, but only one position in the alphabet.
SZX - SYX is the only other such example cited here. Any more?
I've actually logged a route where the origin and destination were in alphabetical order.
In 2014, I flew MCO-MCN-ATL on Silver Airways. I wanted to log Macon before it lost its air service.
I thought I would be the only through passenger on the flight, but I was surprised that most of the passengers who boarded in MCO stayed on board all the way to ATL.