How many B-17s took off from Midway for the first air attack ?
When the evacuation party arrived by PT boat from Corregidor on March 16 , four B-17 Flying Fortresses from Australia flew up to Del Monte : B-17E 41-2408 , B-17E 41-2429 , B-17E 41-2434 and B-17E 41-2447 and evacuated them to Batchelor Field .