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"I've wondered for years about one-way reliability. You know what I mean: all defects occur on the inbound sector, usually the last of the day. 
That dreaded phrase, uttered by a tired pilot talking to OPS: "Is this aircraft down for the night?" Loud groans from the Line Maintenance office.
On a related matter, I've audited several GA commercial operations. The audit of their technical logs often reveal no defects for weeks.
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...and not forgetting the flurry of entries that appear just before an aircraft goes in on its Basecheck