LONDON — The British summer this year has been a nonevent: Rain, clouds and wind. The temptation has been to fly south to the Mediterranean where the sun has been scorching.

But there is no joy in flying these days. The main London airports are overcrowded, there are long lines for check-in and security checks, many flights are delayed, and luggage, if it has not been lost in transit, takes a long time to reach the carousels.

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