1239** ARNs were issued in May 1973
They were known as an "Addressee Referance No."
back then and your licence had a different number.
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The ideal camera for those aviation pics, keep it simple, get a good quality point and shoot camera as demonstrated by some of the members posts on this thread. I still use an old Canon A40 as my tool box camera.
DSLR’s are great I have an Olympus E300, but to get the best out of them
you need to know a bit about photography and they are also a bit big and heavy to carry round unless this is your thing.