The save game I included in the initial post has 15 air to naval combats but only six are reported. Look at hexes 302,342 (2 combats), 304,340 (1 combat), 202,268 (6 combats), 177,304 (3 combats), 179,303 (1 combat), 180,303 (2 combats). I am using version 1.10.
Hope this helps
Jack