So, you're tooling along at 35,000 feet from ABQ to ORD at 485kts and glance out your window to see a speck leaving contrails some distance to your south and below you.
In the past, you would have just had to wonder what it was and where it was going.
Now that there's an internet connection on the plane, you just call up
Plane Finder HD on your iPad and discover that what you're looking at is a Southwest B737-800 flying from PHX to MDY at 33,000 feet.
.