Spunky Monkey,
Bit similar to your wrong aircraft:
MANY years ago at, IIRC, Kirkwall, FO Basil says to captain "I'll go and set up the flight deck - see you out there."
Pre-departure checks complete Bas sits back to peruse daily newspaper.
With five minutes to departure, super alert (not) Bas notices no captain, no cabin crew, no passengers - THAT feeling begins to arise
Upon goin to door and looking out Basil espies stewardess looking anxiously from the OTHER Viscount parked facing Basil's (incorrect) choice of aircraft.
We still had an on time departure.