I hope this is something the AE developers look out for..
OK, I should have set my carrier aircraft at "Do not Upgrade"
July 43 Invasion of Torokina, I sent off my Amphib force with 4 x CVE and CA/DD support. Following them was a CVTF with 2 x CV and 2 x CVL. All fighters on LRCAP.
The CV & CVL still had F4F-4 but I was expecting the F6F so had the CV sqns set to upgrade.
Both fleets merrily sail off to Bouganville and 3 MarDiv lands succesfully. The CVTF is 1 hex off Torokina.
The japanese try to intervene and send in about 50 escorted Betties, my CAP of about 100 F4F-4's fight them off and there is minimal damage, thinks are going great.
(This could have been 1 turn later) I'm lazily watching those messages at the end of the turn and up pops " VF## on USS Hornet upgrades to F6F" !!!! Isnt that sitting off Torokina !!!
Next turn I look at the CVTF and find both CV fighter sqns have upgraded, despite being at sea?????
Luckily the CVL & CVE put up enough CAP while my CVTF headed for Dodge, well Lunga anyway.
In ??thousands?? of turns I've only seen it once, so I'm not calling for the bug police, but its worth looking at ensuring it doent happen.
Interdum feror cupidine partium magnarum Europae vincendarum