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Sep 7, 2016 at 16:02 comment added nigel222 Marginal cost depends on the loading and load-distribution on the plane (which brings freight, if any, into the calculation). The prevailing wind direction is also relevant, as is the price of oil. Tail-heavy is bad, but they won't move you into Business class unless there are no business-class passengers on the flight, so as not to upset any folks who paid silly money for a seat in business. Empty is effectively slightly tail-heavy. They won't offer all economy seats on a positioning flight ultra-cheap, just (maybe) the few that should save them fuel by being occupied.
Sep 7, 2016 at 15:54 history edited VMAtm CC BY-SA 3.0
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Sep 7, 2016 at 15:42 review Low quality posts
Sep 7, 2016 at 15:54
Sep 7, 2016 at 15:36 comment added mts It's a nice thought and I'd give you +1 anyway if you did the calculations for the marginal cost of a passenger on a typical commercial aircraft, but your answer completely ignores airfare pricing, with subsidized flights, promotions, positioning flights (you mention), fare classes, cash effects from early booking and payment, seasonal effects, bad management, ...
Sep 7, 2016 at 15:32 comment added nigel222 well, I hoped it clarifies the issue of promotional fares, and suggests another reason why airlines might advertise some extremely cheap fares on a flight that would otherwise often be completely empty.
Sep 7, 2016 at 15:27 comment added JoErNanO I fail to see how this answers the question.
Sep 7, 2016 at 15:26 history answered nigel222 CC BY-SA 3.0