If there are failures beyond early failures like a PPL checkride I think it has tightened up a bit.

That said, pilots family on 3591 is suing Amazon and others.

"Amazon is also facing action for negligence for leasing an aircraft that was not maintained properly, saying: “Amazon knew or reasonably should have foreseen that the failure to exercise reasonable care in the maintenance and use of the aircraft, including ensuring its airworthiness, created a broad zone of risk that posed a general threat of harm to occupants of the subject aircraft.”"

F&E is accused of breaching its duties by failing to service, maintain, repair, modify, test and inspect the aircraft and make sure it was safe to fly.

Flightstar is facing action, with the lawsuit saying it should have known that if the aircraft was not properly maintained, there would be an “unreasonable risk of harm to persons operation, flying, and/or being flown aboard the subject aircraft”.

Not sure how those cases turned out.