I don't know why the company has not sent out the link for the app when they mentioned on one of our weekly updates about us being able to start tracking with GPS where our van driver is with est of when he will arrive but here it is. For iPhone users goto the App Store and search for dartcrew it's free
We tried it on a iah hotel pickup and it was awesome.
U put in date ur airline code flt # airport code and whether you are arriving or departing and it brings back his location or pickup location or telephone contact info like the uber app.