Winging together sounds good. If you're in a wing do you automatically accept the same missions, or just pool the rewards? Would like to know more how that works.
Here comes the kicker: Taking missions as Wings is not supported. And it hasn't been, since Wings was introduced shortly after the vanilla release. Edit: Not to mention that pre 2.2 (release two years after Wings update!), "winging up" meant that your payouts were practically divided by the number of players in your wing. No, there never was an enemy or reward scaling of any sort for wings and you can practically do everything alone. In 2.2 they realized that was an idiotic penalty discouraging cooperative PvE and introduced full symmetric payouts as a crutch.
There are few missions you can sensibly do as a wing, but it's a bit of a pita. Namely massacre missions, but everybody has to take the same mission by themselves and then you can go to a conflict zone (unstructured pub brawl in spaceships, Elite's representation of a "war" *rollseyes*) and kill your targets together. Have fun finding appropriate places to do it though, as the game
doesn't tell you shit. There's a system in a war state? 15 minutes to go there, another ten to check out whether it has appropriate missions and conflict zones, another 20 minutes to get your friends there. That's assuming you hit gold on your first try. Want to do another run the next evening? Oh, we're sorry, the war state has just ended (lasts some 3 days iirc?) and the missions have dried up. Better luck next time!
It's good fun when it works, but the whole experience is so cumbersome that we've stopped bothering. Evening game time with friends has turned out to be more valuable than that for us.