@craigclayton59 wrote:
secondly, when checking flight status if you have flight number there is NO REASON to enter the to and from city.
That isn't completely correct - the same flight number in many cases follows an airplane across the country through four (or more?) stops.
So tracking your flight by flight number only won't be sufficient on those routes where the flight number continues across multiple stops.
Some flight numbers are indeed between one city pair and that's it - in that case yes it is over specified.
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