Flight Tracker working erratically

Hi there,

I've been trying to use Flight Tracker for its intended purpose, but it doesn't work well. The only airline for which I can get information is JetBlue.

I'm trying to track a flight on American from Dallas Fort Worth to Boston (Logan). When I put in the broadest search term (All Airlines), I get nothing. Not even a "no Flights found". In testing the widget to see if anything might work, I found that it will track some flights, but apparently only those of JetBlue (which I found by putting in information on JetBlue's airports and seeing what came up).

Any ideas why this is the case? Any solutions?