Alright, me and another guy on here boosted it and here's what we did. Almost every European map's original spawn point has an AA gun. Simply have the other player deploy two sticky dynamite and climb in. To help you see what you are doing, have the other player fire the gun straight up into the air and fly your bomber in 3rd person view. This should help you find the gun and line up a shot. It also prevents people on your own team from shooting them out of the turret before you can bomb. The down side is that people on the opposing team love to shoot down bombers and people on yojr team may bomb them first if they see the gun fire. It took us 3 maps for me and the other guy to both get the achievement. We obviously did this on conquest. The best maps are Arras and Narvik.
EDIT: DICE now allows community created servers where you can make your own game and then make it private. You would need to gather enough people to start a round but this might be ideal if you are having trouble in public servers.
EDIT: You need to be at least level 7 to open up the bombers, you need at least 4 players (2 per team) to start a round on a private server. DO NOT PUT A PASSWORD on the server or it will not track progress. If you are the host, just kick random people joining. Again, Arras amd Narvik are the preferred maps but Panzerstorm may also be good to get this achievement.
EDIT: The other online achievements may be done as well if you have the right number of people.