Wouldn't it have to be a price drop for google to be out any money? It's a low price guarantee, so price spikes would only make them look good. Airlines aren't going to randomly drop prices to spite google...
In June, I was literally in CVG airport (inside of security) when my Delta flight was delayed. I decided not to book a ticket on United that was leaving in ~35 minutes because I wasn't sure that I could get over to the other terminal before boarding closed. (It also wasn't 100% clear that the United flight was going to make the connection in DC because of weather that was also screwing up Delta.)