who was Lawrence yelling at outside the airport?

my take was that he was yelling at himself for the pain he put himself in
he "wanted" Gina--at first maybe just for a sexual encounter but then came to care for her as person,
he "wanted" to keep his job so he finally had to split with her vs giving up his job and leaving with her
so basically he is saying he "wanted" all the bad results that came: losing Gina, his job, opportunity to stand up for what he believe in, opportunity to stand up for her and redeem himself in her eyes
and he is kicking himself in the ass for being an ass

and since the last question he asked Gina was "Was it your child" and got the answer "does it matter" which made him look like a fool who would put a child in need into two categories--mine/others
which basically goes back to the issues of the conference---mine/others since most of the countries were more about keeping their money to protect their own people vs putting it out there to protect "other" peoples

"...That's the beauty of argument, Joey. If you argue correctly, you're never wrong..."

I think by "it" he primarily meant his station in life. Judging by his dreams, one can presume there had been that time in his privileged years when he was facing the decision on which of the two roads to take in life. He went for more proper and secure lifestyle that comes with many perks and conveniences, but at a price (in his case, at least) of living his days more undead than alive. As he watches his big/last chance to be alive fly off into the night, he becomes acutely aware of that price. For three seconds, as he screams his lungs out, he finally admits he regrets the decision. And there peeps out that version of himself which he turned his back to, back in the day: the self-assured, no-holds-barred, I'll-curse-if-I-want-to kind of guy. Too bad it's he who he's cursing at.

no i am db

I agree with some of what Flickfan said and all of what monarchgirl said ...

But i think there's something more specific as well that he is referring to in this anguished outcry. I think he's referring to what Gina said to him in the room (at a B&B?) that she was taken to and where Lawrence finds her...

She says to him ""I'll try to take comfort from the fact that I was trying to do what you wanted me to do even though you didn't want me to do it."

I believe he is echoing her insight into his own split self, his dissociation "as it were" :-) ... and realizing how right she was that he really deeply did want her, if not himself, to speak out for the beliefs and priorities they both share - and he realizes as she flies off that he has not had the courage of his convictions that even she saw in him as well as her being able to speak up for them for herself.