Air Traffic Control

I have been tracking a flight from Dubai to Heathrow on an iPad ap.

You can follow the thin blue line (no not the Thames, silly) from the right hand side until it lands at Heathrow showing an altitude of zero feet on the data box. The aircraft in question is shown in red.

The flight was due in 20 minutes early but then dawdled along, making lazy circles in the sky until, I suppose, a slot opened up and it landed two minutes late.

You can also see half a dozen other planes, in yellow, following a similar flight path into Heathrow