Here's why a delay may decrease. The airplane is repaired quicker than anticipated. The airplane being used makes up time enroute to the location you are at. A different aircraft is used than the one that the delay is being used in the delay. A different crewmember is found and used rather than the one they were waiting for. The aircraft is MEL'd rather than repaired. There are numerous reasons, most of which the passenger doesn't get but the bottom line is when the flight goes off scheduled departure time, it is more than wise to be in the gate waiting for word rather than not. An obvious lesson learned here.
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