What Nathan told at CC is not canon, he teased the audience.

halaci said:

The murder board with the missing 3rd man was in open sight in the precinct so Esposito's text would require more than "some creative storytelling". Saving Montgomery's reputation and their own ass at the same time would be impossible, the "arrived late" explanation simply doesn't work: the police parked an evidence in the hangar (hangar or hanger?) together with other valuable aircrafts, there had to be a CCTV system to avoid thieving or unauthorized tampering the machines. Not to mention that the IA invetigation should have started right after it happened when Beckett (but I can say Esposito, Ryan and Castle as well) were not in the state to serve hole-free, corroborating stories about what happened. The first question would be that why did he called them (not only Beckett) to a place in the middle of the night where none of them had any business at that time? A beginner investigator would rip their stories into pieces in no time, no surprise that it was not even discussed what was this story. I think it is better to leave this part of the show to the suspend of disbelief, just like the dirty bomb.

You're forgetting one thing: Ryan told Beckett when they first found the chopper at the hangar that the hangar operator wouldn't have known it had been taken were it not for his noticing the bullet holes in the chopper's fuselage.  Doesn't that mean that there was no security camera looking at that hangar?  And regarding the police clocking in to the airfield, that would be true, but I'm sure all the security would do would be to let them in once they flash their badge and any necessary warrants.  And if that's true, then how did Lockwood and his cronies get in?

And I agree with FillKat's scenario above.  They could all easily argue that the reason they chose to meet at the hangar after hours was extra protection for Beckett, since her mom was killed and Raglan was killed right in front of her.  Then they say, Lockwood found them anyway, a gun battle ensued, and Beckett and Castle arrived too late to help Montgomery. 

I don't want to turn this into a big thing, but I really disagree with you and think the "We got there too late to help him" explanation would fly to IA.  They would go as far as to check the entrance log for the airfield in this case anyway, since Beckett's gun hadn't been fired, none of the bullets can be traced to anyone's guns except Montgomery's and Lockwood's and everything else, except as you correctly pointed out the text from Esposito which could be wiped from the phones, falls into place.  Let's just agree to disagree. 

halaci said:

 But this is a show and the goal of this scenario was not to be accurate but to heighten the emotions.

Agreed.  It's entertainment, not reality.  I still disagree, but it sounds like we should move on since neither of us will change their mind. 

Baruch said:

From what I gathered, this was not a major airport. This was a general aviation place. These places don't have fancy security, they feature rent a cops and I don't even believe they have CCTV cameras. There would be just too much nothing doing to make it worthwhile.

Like Hillsboro or Vancouver, right?

rickcastle said:

… if anyone knows who's the man that received those files from roy pls tell me cuz im really curious

Mr. Smith, someone who "owes his life to" Captain Montgomery. Beyond that, he's a mystery.