The elderly President reluctantly ordered the Czechoslovakian Army not to resist. The aerial part of the German occupation of Czechoslovakia was carried out by 500–650 aircraft belonging to Sperrle's newly renamed air fleet, Luftflotte 3. The majority of these aircraft were concentrated in the 4 "Fliegerdivision" (4th Flying Division). The operational condition of the Luftwaffe was at 57 percent with 60 percent requiring maintenance, while depots had only enough replacement aero engines to cover 4 to 5 percent of frontline strength. Only 1,432 of the 2,577 aircrew available were fully trained. Just 27 percent of bomber crews were instrument trained. These problems effectively reduced fighter and bomber units to 83 and 32.5 percent of their strength. The Luftwaffe's saving grace was that the British, French and Czech air forces were in slightly worse condition in 1939.