e.ferreira, post #63: What I would want before treating Airline travel as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of the three are usually missing.
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Post #90 answers the question as asked. The question underneath it is different.
Summer routes and winter routes are genuinely different problems, and a supplier that changes its packing between them is doing something rather than nothing.
Same conclusion as the reply above, reached differently, which is mildly reassuring.