Tan Son Nhut Air base available during all of the time for evacuation of Saigon.

What if during the evacuation of Americans and South Vietnamese at the end of the War in Vietnam, the Tan Son Nhut Air Base was not shelled and the airport stayed open? Assuming that Operation Frequent Wind was also used to maximize the number of people evacuated, how much of a difference would being able to use Tan Son NHut Air Base until the end make in the number of people being evacuated?

"On 28 April, Tan Son Nhut Air Base (lying adjacent to the airport) came under artillery fire and attack from Vietnamese People's Air Force aircraft. The fixed-wing evacuation was terminated and Operation Frequent Wind commenced. The evacuation took place primarily from the Defense Attaché Office (DAO) compound, beginning around 14:00 on the afternoon of 29 April, and ending that night with only limited small arms damage to the helicopters. The U.S. Embassy in Saigon was intended to only be a secondary evacuation point for embassy staff, but it was soon overwhelmed with evacuees and desperate South Vietnamese. The evacuation of the embassy was completed at 07:53 on 30 April, but some Americans chose to stay or were left behind and some 400 third country nationals were left at the embassy."
 
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