You are in Sydney and it's 1972. You are booked in first class on a flight to London which will make six stops en route and also has an interesting flight number change from flight 785 to flight 785A at one of the stops. This particular flight operates this specific routing only once a week on Fridays. Identify the air carrier, all six stops in order and the aircraft.
Well, this could be anybody, as quite a few used to renumber flights with an A on the end on this route. BOAC used to do it if they routed through Hong Kong, Air India used to do it passing through Bombay ... but I think those two kept the main unsuffixed number for the London end.
So I'll go for MSA, with a 707. Those 6 stops could be anywhere. Complete guess at Perth, Singapore, Colombo, Bahrain, Rome and Frankfurt. Those are really the main points along the way (Bahrain was the main Gulf point, but lost it to Dubai).