BP opened a new refinery at Little Aden in 1954. Plenty of civilian Brits and Europeans connected with the refinery would have been be flying around in those days I expect.
1954 Aden Airways timetable here:
Index of /ttimages/ad/ad54
This shows a direct Aden Airways Argonaut flight (AD. 470) Aden - Cairo and vice-versa on Fridays and stopping flights on some other days.