Does anyone know how the OS-->UA connection works at IAD if a wheelchair is requested? Does the wheelchair take the pax all the way from plane through immigration/customs to the UA gate, or is the passenger on his/her own for at least a part of it? If the wheelchair does take the pax through immigration, does the pax wait in the normal immigration lines or does the wheelchair go around the lines?
The wheelchair meets the passenger coming off the OS flight; takes them through Immigration/Customs in the mid-field (C Concourse) facility; and to their gate for the connecting flight.
Wheelchair passengers (and their accompanying party) bypass the normal line at Passport Control. They generally get quicker service assuming there isn't a long line of wheelchair passengers.