I should have paid more attention to the appearance of those fighters in Singers and rested the bombers, doing sweeps:
Air Battle 1:
Morning Air attack on Johore Bahru , at 50,83
Weather in hex: Partial cloud
Raid detected at 38 NM, estimated altitude 20,000 feet.
Estimated time to target is 10 minutes
Japanese aircraft
Ki-21-IIa Sally x 24
Ki-43-Ia Oscar x 17
Ki-43-Ic Oscar x 25
Allied aircraft
Buffalo I x 10
Hurricane IIb Trop x 7
P-40B Warhawk x 13
P-40E Warhawk x 23
Japanese aircraft losses
Ki-21-IIa Sally: 12 destroyed, 5 damaged

Ki-43-Ia Oscar: 2 destroyed
Ki-43-Ic Oscar: 1 destroyed
No Allied losses

Allied ground losses:
5 casualties reported
Squads: 0 destroyed, 0 disabled
Non Combat: 0 destroyed, 0 disabled
Engineers: 0 destroyed, 1 disabled
Runway hits 2
Air Battle 2:
Morning Air attack on Johore Bahru , at 50,83
Weather in hex: Partial cloud
Raid detected at 32 NM, estimated altitude 25,000 feet.
Estimated time to target is 9 minutes
Japanese aircraft ** No Escorts **

Ki-21-IIa Sally x 22
Ki-48-Ib Lily x 22
Allied aircraft
Buffalo I x 10
Hurricane IIb Trop x 5
P-40B Warhawk x 10
P-40E Warhawk x 18
Japanese aircraft losses
Ki-21-IIa Sally: 8 destroyed, 3 damaged
Ki-48-Ib Lily: 9 destroyed, 1 damaged
No Allied losses
Airbase hits 1
Runway hits 1
But the day was balanced somewhat by the developing movements toward Palembang.
as reported in game screen on 13th Jan turn:









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