I don't think the tarmac delay rule is clear, intentionally. Here's what the DOT website states:
All carriers subject to the tarmac rule will be required to report lengthy tarmac delays to DOT. In all cases, exceptions to the time limits are allowed only for safety, security or air traffic control-related reasons. Carriers must also ensure that passengers stuck on the tarmac are provided adequate food and water after two hours, as well as working lavatories and any necessary medical treatment.
So, if the delay was ATC related, possibly due to weather, they seem to be exempt. Also, they can cancel the flight without penalty, and if it's weather related you will receive 0 compensation.
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