Answer:
Asperger syndrome
Step-by-step explanation:
Asperger syndrome is in the same category as autism and is a neurodevelopmental disorder. The symptoms such as verbal and motor skills are usually less severe when compared to those presented with autism.
This is why Sam is able to have a good verbal language, has difficulty understanding non-verbal body language ,obsessed with airplanes and has the knowledge of the name and specifics of every type of aircraft.