The one remaining gap that I have in my flight log of 423 flights so far, is the pair of Aviaco flights that I took from London Gatwick to Palma de Majorca and back in the summer of 1973.

Ideally, but quite a long shot, I would like to find out the a/c registration and type for the following flights:
31st July 1973 AO1013, left LGW at 6:35PM
14th August 1973 AO1012, left Palma at 3:35pm

I am presuming that it was their recently acquired Caravelles, but they only took delivery of the first of them a few weeks prior to my flight, so maybe not. It was too soon to be a DC-9.....

If anyone can help, I'll be eternally grateful!