Overview of path shapesPositions for approach and departureApproach functions APPR LT and APPR PLTApproach functions APPR LN and APPR PLNApproach functions APPR CT and APPR PCTApproach functions APPR LCT and APPR PLCTDeparture function DEP LTDeparture function DEP LNDeparture function DEP CTDeparture functions DEP LCT and DEP PLCT