The Umbrella base on Rockfort Island was complemented with a number of transport planes. They were used to evacuate the island after a strike team led by Albert Wesker caused a viral outbreak. Claire Redfield and Steve Burnside used one of them to escape the island too, who were followed by T-078 breaking into the cargo room.
The planes with infected passengers landed in the Antarctic Base causing another outbreak. Claire and Steve whose plane was controlled by Alfred Ashford, made its way to the same location causing a crash.