If there was a maintenance issue, why did they sit on the tarmac for over 3 hours instead of returning to the gate? If they weren’t able to taxi then get a damn tug.

No excuse to leave passengers sitting on the tarmac for over 3 hours with no air or water. In fact in the US it’s illegal, not sure what Mexico’s laws are.

Sounds like Aeromexico needs to review their policies that allowed this to happen.