 Trưởng's defense plans were hampered by the presence of 1–1,500,000 refugess and ARVN stragglers who had crowded the city.Throughout 26 March evacuation flights by Air America, Air Vietnam, the RVNAF and World Airways from Da Nang AB took place but could not keep up with the vast tide of refugees.On 27 March the situation at Da Nang AB was becoming increasingly chaotic as panicked refugees surged to board a World Airways flight and began mobbing the other flights and gathering on the taxiways and runways.