I find trip alert to be ultra frustrating. Its such a poorly implemented piece of technology. For at least a year I would get txt messages with my connecting gate information at IAH, CLE and EWR. Now I get one 2 hours before my flight leaves. Nothing else. Just think of all the dollars they could save reducing the numbers of "agent(s) who will meet you at the gate with connecting flight information" if this thing actually worked. The fact that people have conflicting experiences with it just reinforces my belief that this is an implementation problem. Maybe its cell providers, who knows, but its been around long enough it should work properly by now.