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SimonS1 yes it is common for the leasing airline to have one of their own crew onboard a leased airlines flight to have a brand presence as well as to answer any customer questions and help the wet lease airlines crew out with the inflight service (from an advisory perspective).
They will not operate as crew however (they are unable to from a regulatory perspective) so will normally have a seat blocked in the cabin and be referred to as a representative.
This may interest some and perhaps AndrewinHK as it outlines that serious problems (evidence) with commercial airframe fatigue exist.
“A world-wide survey of serious aircraft accidents involving airframe fatigue fracture has been carried out (2022).
The study includes not only fatal accidents, but also those in which the damage to the airframe was substantial or greater. A total of 1885 accidents were identified as having fatigue fracture as a cause or related cause, these accidents resulted in 2240 deaths.”
The above included ALL fixed wing passenger commercial aircraft military and civilian and many of the accidents would clearly have involved smaller military aircraft.
There is a huge amount of information available on the internet on the subject but most is way beyond my understanding.