WCH(S) - The S does not stand for stagger. This was a term that was created during training so that staff could remember the three different types of wheelchair assistance. It stands for STEPS, and I can't bare it when people refer to a wheelchair passenger as a stagger! Especially when they use the term freely over the radio, or in front of the passenger! Wheelchair SIERRA is much more professional.
WCHR - Wheelchair to ramp - Passenger is unable to walk any distance, but
Can ascend / descend steps
WCHS - Wheelchair NO STEPS - Passenger is unable to ascend / descend steps, but can walk to their cabin seat.
WCHC - Wheelchair Carry ON / OFF - Passenger is completely immobile and requires a lift on / lift off service
WCMP - Manually powered wheelchair
WCBD - Motorised Wheelchair (DRY CELL BATTERY)