FlightRadar24 - amazing.
DS was on a flight that had an aborted landing at City Airport last year, and he text to tell me!!! I spent the next hour telling him where they were, that they looked to be headed to Stansted, then the flight aimed back to City as the storm had passed.
I watched the flight coming in with all fingers crossed, and saw it land. Phew.
It was quite stressful at the time - especially with his texts about loads of passengers throwing up etc., but very cool to send a screenshot of the route they were taking, so he could see all the squiggles for himself. 
And yes, DH slept through it all!