Something Strange

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I can't remember a time when, in the UK, I haven't been aware daily of aircraft flying overhead.

There is a strange silence, or rather an absence, because apart from light aircraft and military aviation, most aircraft overfly us at about 25,000 feet as they either begin their descent from or get near to completion of their ascent to cruising altitude.  The lack of vapour trails in the air is disconcerting.

The sky looks different.