SL SECURE: DOOR-TO-DOOR | SL TOP: DOOR-TO-DOOR SL FAST: DOOR-TO-AIRPORT | SL FLEX: DOOR-TO-AIRPORT   SL FAST: DOOR-TO-AIRPORT SL FAST is the right transport solution for time critical shipments, service features are: Use of lower-deck capacity on scheduled quality carrier flights—on non-stop, direct flights, whenever possible. If the transportation from origin to destination involves a transfer, the longest permissible transit time at transfer point is 24 hours. Transit time: fastest available connection on same route for passenger transportation, plus maximum of 24 hours.