The SWL-150 is the plane with the most variants. Links below. Profile page.
SWL-150
SWL-151
SWL-152
SWL-151-1
SWL-151-2
SWL-151-2 neo
SWL-151-2 neo ER
SWL-151-3 ER Passenger Version
SWL-151-MAX
Plane descriptions (Each plane has the same features as the last, in addition to the new ones (Except engines and liverys)):
SWL-151
1. Wings face up
SWL-152
1. Stretched fuselage
SWL-151-1
1. New lights
2. Slats
3. Bigger flaps
4. Engine tailpipe is longer
5. New colors
SWL-151-2
1. Bendy wingtips
SWL-151-2 neo
1. New engines, with working reversers
SWL-151-2 neo ER
1. Extended range
SWL-151-3 ER Passenger Version
1. Has windows & doors
2. More cameras
SWL-151-MAX
1. Redone cockpit, with new center sticks