I will be brief here:
1) Display complete flight schedule
I am missing it from the top menu, I know it is on airline's landing page but still used to go for it from the menu.
Suggestion: put it back to the top menu
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2) Search for airport using regular search box
Suggestion: typing *IAD (that's an asterisk in the front) for example in regular search box would display IAD airport directly
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3) Aircraft registration number access via Scheduling
Old route management showed aircraft registration number for quick access. Inventory now shows this through the "groupped view". Scheduling does also show it in certain way, but on the right side of the screen with the scheduling box. But if you select JFK-ORD route in scheduling, and there are 10 flight numbers, the scheduling box displays on the right side of the screen displays the first flight number (along with A/C registration number) but to get registration number of 8th flight down the row, you need to click an |> arrow for the flight number and get a refresh of scheduling box to the right, then click the aircraft registration number.
Suggestion: Place the aircraft registration number (even in small font) next to the flight number in the flight number list on the left right corner of the scheduling
screen.
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4) Suggestion: Quick access to airport/station from the airline's landing page
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5) Suggestion: Make "Origin Airport" persistent in Airport Pair section of both Inventory and Scheduling