Hi Ryder,
maybe this helps a bit:
arrivalDelaysRaw = FlightData[Entity["Airport", "MEM"] -> Entity["Airport", "LGA"], {"ArrivalDelay"}, {DateObject[{2023, 1, 1}], DateObject[{2023, 1, 10}]}];
arrivalDelays0 = DeleteCases[arrivalDelaysRaw, <|"ArrivalDelay" -> Missing["NotAvailable"]|>];
arrivalDelays = KeyValueMap[{#1, UnitConvert[#2["ArrivalDelay"], "Minutes"]} &, arrivalDelays0]