This very handy app has more than once alerted me to the need to change a seat before getting stuck with my feet wedged into the space left by an ‘electronics module’ under the seat in front of me. It’s not exhaustive. For example, the USAirways Embraer E90 that’ll take me from Philly to Indy is not to be found. But perfection is a high bar. This app is very good.