One thing that really intrigues me abut aircraft. Does the sheer size and complexities of an engine really allow uncompromising accuracy on efficiency?
In a totally guestimated, over-generalised form, I kind of worked out (albeit, no doubt missing out on a few scheduled maintenance periods!) That if, say, one power plant on one aircraft, say a UA/BA/AA 777 running JFK to LHR, was burning just £1 per mile too much fuel, over a year period - could this really cost the company £1,300,000? (As I say, naively based on:- 3000miles per trip, 2 trips per day, 5 operating days a week, 4 weeks a month, 11 months a year. Allowing more than enough for maintenance and checks.)
Do power plants of this size really run that efficiently? What about a 4 pod a/c - the inefficiency costs would be crazy!?
Maybe this helps understand why some larger airlines struggle!!!
P.S I am not an expert so please refrain from insults!