Additional information besides the Estimated Time of Arrival is included on the image returned by a successful Flyte Trax query. Here is the key to these numbers using the sample image at the top of this page.
UAL34 United Airlines flight 34
253/B757 Elevation: 25,300 ft above sea level / Aircraft type: Boeing 757
4:41/491 Estimated Time of Arrival: 4:41 / Speed of Aircraft: 491 Knots
SFO BOS Departure Airport ID: SFO / Destination Airport ID: BOS
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