For years I have been wishing for "flight intergrity" within the squadrons (in the Campaign mode) as it, generally, was in real life. Losses, leave, transfers, new arrivals, not withstanding.

Don't know about kette integrity within the Jastas - JFM?

And now with ME we have a tool that can accomplish that. Always have the same flight members with you on campaign missions. Have not tried it yet but I think ME can do this no problem? JJJ65?

Course casualties in WOFF being what they are this is no boon to your poor AI flightmates, having to fly "more" but it will, if nothing else, be cool see how your mates progress, keep tabs on them, etc. Unless, of course, it turns out to be a wholesale personnel change every 5 missions because of losses.

Basically I feel you'll now have a (better) reason to try and take care of them as they will no longer be "semi-faceless" in the crowd coming (and going!) almost without notice.
Now to pick my flight members. Or better perhaps a random selection...

Yes I have not had a real chance to delve into ME heavy besides making sure it works.
My first several UE missions were fine as generated (using modified Bletchleys mission mod) so I have not dug into it.

If you know: Can I add any members of the squadron to the flight or can I just a mashup just the flight members assigned to that particular mission?

You can add any member from your squad to your flight, however, he must be available (not on leave, wounded or already assigned to a mission). Or you can delete assigned pilots to get free positions and then select yours. Mission editor does it automatically for you - Just click Add Pilot button, Your squad roster shows up and then you can just by left mouse click select any pilot you wish to add to your flight. Detailed info window about selected pilot is shown and then you can click "OK" button and pilot is being assigned.

Thank you gentlemen!
Cooking with gas now...