At the end of the day its up to you to decide, but on an individual basis probably not and its so far after the fact, I don't think its right. #1 - depends on the reason why the plane was stuck. #2 Stuff happens. Its only 1.5 hours. Bummer yes, impactful no. #3 Act of god. It should be denied anyway and its morally wrong to request comp for weather which is completely outside the airline's control. In the future, if there are that many delays in a short amount of time, for an airline that prides itself on being the on time machine, I might send in, and briefly assess how they handled each one (positive and negative). If you are going to ask for comp, at least give constructive feedback. DL is pretty generous with the comp, but don't abuse it.