Is it just me or is ridiculously hard to win in the air port as security. The first objective is fine and even the second most of the time but the third where you have to run the data back is so hard and i get killed when i am within 5 meters of the finish and then it just gets re set. Im not saying it is impossible but i would like to know if any one has any tips
I am not complaining and i dont want to sound whiney but some advice would be greatly appreciated.

Honestly if your playing solo its a bit of luck and a bit of timing...the best way I have found to do it is with a light or med body type. Wait till the AI is almost all guarding the item, wait for your NPC allies to grab their attention and run in grab it and hope you make it to the upload terminal before they get there and gun you down.
For me once I get it I never stop running and ignore any enemies unless they are in my way and I gun em down as i run past.
Hope that helps some.

That is the only thing i know to do but it does not help very much

I had a lot of trouble with this too considering I had to play solo [ps3 user]. And what i did to remedy my situation was after unlocking the safe and the next objective being to swipe the data key, well if you got lucky enough to make it out of the area the first time, then it's just bad luck you ran into an enemy along the way. But if you're having to go back repeatedly to try and get the key like I was I stuck with the Engineer class to keep buffing my damage and try to make killing the guarding AI and turrets they set up a bit easier, which still wasn't all that easy mind you. Maybe I'm impatient or maybe the AI I was working with didn't want to distract the enemies, but most of the time I'd get a lucky grab then get a zinger in the back which killed me with about four guys rushing over and someone butting me with their gun.

My advice, and it did take me a while to do, would be to get a short to mid range effective weapon somewhere, for instance I used the Ritchie Revolver, but the Mossington Shotgun could work too. and get something that could work across the spread of the room as well, and I would always go behind one of the dividers for maximum cover as well, so I could slip out as close to the key as possible and then run virtually right back the same way I came from. This is just a suggestion though.

For the "get case and run away" part of the mission, you really can't go past a Light Medic.

Buff your health on the way out of your spawn, throw a frag to rebound into the area - worst-case scenario, you get the enemies running out of the room - quickly rush in and pick the thing up, then just jump over the easiest railing to reach (there's one on either side, go for where the least enemies are) before beelining it to your objective - I you're good, you should be able to stay ahead of them and avoid getting hit too much - and you can self-buff as you go.