Just a few question regarding KLM's 747SUD's
# How many of KLM 747-200 were converted to SUD?
# Are they still in service (both, the freighter and passenger version)?
# In general, how can you differentiate between B747-300 and B747-100/200 with SUD modification?
# In adding the SUD kit, will it effect the performance of the airplane (range, payload, etc), other that increasing gross weight and capacity ?