Mars,
Airlines are responsible for the actions of their sub-contractors. For example, they must provide wheelchair services to disabled passengers. For many of the airports, the airlines contract in this service... but it is the airline that would be held to account if the wheelchair was not provided. Likewise, some sub-contract out maintainance... but that does not mean they are not responsible if there is a maintenance problem. The status of who owns equipment or employs individuals is irrelevant to their obligations under the law.
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