Wait, who else would you like to introduce to the airlock? Actually, Ashley was the only person, who I wanted to throw out of the airlock. Ok, I admit there was something else, that I wanted to eliminate.... namely it was the council. You can't imagine, how much I regret, that I saved their asses in ME1 
Haha...the Counsel, yes
...I think that Turian was everyones choice for the Airlock, though I did like his turn around in ME3 and somehow I think it kinda fit him. Why did you save the Counsel? I watched the arguments flying back and forth on this Forum way back then, to save or not save the Counsel and feel both sides had very valid points...I save them because though it's taking a big risk to not concentrate on Sovereign, there is also sense in keeping the Destiny Asension flying for it's added Guns in the fight (though I don't think it turned around did it?), plus need a united Galaxy, not a fractured one if the Reapers did get through and the Counsel (at that time I thought they would support) were the best chance to keep the Galaxy united.
As for Airlock:
ME1: Mainly Ash in ME1...though as I played through a number of times and went onto ME2, my ME1 cast grew, nothing personal against Wrex, his pretty cool as far as Krogans go, but as I learned more about Krogans I felt having one on the Normandy is a dangerous idea, so not so much the Airlock for Wrex, just more of he shouldn't really be on the Ship. I loved Liara in ME1, she was this sweet, innocent, bookish girl, I remember playing ME2 the first time and was hanging out to see Liara, broke my heart when I finally found her, I didn't like what BW did with her, my next ME1 games with her after that is not the Airlock for her either, but more of a just stay out of my way 
ME2: Miranda was Airlock material to me, found her too callous and ruthless, really could not take to her on any level, tried all her dialogs and romance, etc...but nada. Realistically I don't feel Jack and Grunt should have been on the Normandy to begin with, both too dangerous to be on a Space Ship, not really Airlock for them, they just shouldn't have been on board...I did love that Renegade line with Miranda about Grunt lol...
...about opening the Airlock if Grunt acts up. Legion probably really shouldn't have been on the Normandy either, another great risk, but I'm bias about him, love the metal man... 
ME3: Javik out the Airlock, didn't like him at all, very cruel and ruthless species, enough to put the Krogan to shame
...really couldn't take to him on any level either. Allers out the Airlock! though not a squaddie, more of a dishonorable mention 
What I do love about what BW did was how they fleshed out these characters so well and deeply, to the point where so many of us ME gamers have become so passionate about these characters, whether it's love, hate or somewhere in between, they bought these characters to life and made us feel them...watching all the battles that break out over the characters on these Forums, how these fictional beings have effected so many people, the battles over pixals is a shame
though is also a clear indication of how well BW has done 