Some relief planes that have tried to deliver food have come under fire from the rebels.
Fighting has prevented relief planes from landing in Kigali for four days.
The Pentagon has not said why it thinks the Italian relief plane crashed.
It would handle air traffic control and protect relief planes.
The strong winds also caused the crash of a relief plane, causing five deaths.
The relief plane with journalists aboard was unable to land, so the crew dropped supplies without parachutes 150 feet to waiting crowds.
But only a tiny minority get seats on departing relief planes.
Did Robertson know about the diversion of the relief planes?
Now that the thorny political issues have been resolved, some eight more relief planes are expected to arrive in coming days, United Nations officials said.
The Government gave the go-ahead despite last week's shooting down of an Italian relief plane.