Airfields of the Far East Air Force
Within 130 km of Manila, there were 6 airfields. Outside of Luzon, there were another 6 airfields. Clark Field was the only one that could support heavy bombers, until the December completion of Del Monte Field. Another bomber base was scheduled for construction, in the Visayas.
In August of 1941, $1010,000,000 was spent to improve the airfields. Most of these funds were spent on Nichols and Clark Fields, with the rest spent mostly on auxiliary fields at Iba, on the Zambales coast, to the west of Clark, and various points on northern Luzon.