[werftgh]

Unfortunately the enemy are rarely cooperative in allowing your aircrash investigators to visit the site and examine crashed aircraft.

You could examine enemy bombers that you had shot down but apart from the design and vunerabilites being different you would miss those that had exploded leaving little wreakage or had been crippled and crashed over the sea on the way back. You would still select for a set of damage that allowed an enemy place to crash reasonably intact

[nerfhammer]

Some of your interceptor craft would probably crash over friendly territory, but probably not many bombers