This suggestion adds in what the title suggests - deployable flares.
First of all, the flares would be placed in the 'Gizmos' tab and once deployed, the flares will pop out of their, well, 'module' and mess up a missile's tracking system so that it doesn't hit your airplane and blow it kaput. Instead, the missile will hit one of the flares that were deployed and explode. This would provide our planes a defense against missiles around the SP world. However, flares would only be able to deploy once. They obviously wouldn't be allowed in the SAM Evasion challenge, or anything similar to that. This is pretty much it, and thank you for your time.