When a war warning from Marshall was received in the Philippines on 28 November ( Philippine time ) , FEAF began dispatching two B - 17s daily on reconnaissance flights of the sea lanes north of Luzon .
With orders not to overfly Japanese territory on Formosa .
When a war warning from Marshall was received in the Philippines on 28 November ( Philippine time ) , FEAF began dispatching two B - 17s daily on reconnaissance flights of the sea lanes north of Luzon , but with orders not to overfly Japanese territory on Formosa .