Rosters and aircraft assignment with the legality rules applied as the schedule is built, not discovered the day before by someone reading a limit table. The piece every other service fits onto.
Crew sign on at the gate from their phone. The platform watches every departure, warns the people who can still act, and records what saved the flight.
Defects, deferrals and the aircraft's technical record, signed at the aircraft instead of on paper, and in engineering's hands before the turnaround ends.
The operational flight plan on the flight deck: waypoint by waypoint, time and fuel checked against the plan as the flight goes, with no paper to file afterwards.
Confidential reports from the line, hazards tracked to a close-out, and what crews need to know before they fly — so the same event does not happen twice.
Departures, arrivals and navigation routes as digital charts — the current revision on every device, without a revision cycle of printing and replacing.