[Signalman]

Correct, if it is flying an IFR (Instrument Flight Rules) tracked by ATC on radar, or VFR-flight tracking (flying under visual flight rules but you have asked ATC to track you on radar).

[Signalman]

All flights above 18000’ must file IFR (in US and Canada).

[ColdOne]

Thanks for info. I know you can go to faa web site with tail number and get info about plane too.