Iron-man is transported outside a Xenomorph hive by some random overtly powerful celestial (Let's call him bob for naming purposes) Bob has been getting pissed off with the Aliens (whom from his point of view are like ants are to us) and wants them eradicated.
He gives Tony access to his array of armour ( basically every Iron-man armour ever made , excluding Hulkbuster and Thor-buster) and an hours worth of prep time. After that he has to take on the entire hive.
Hmm kinda . Since it would be too easy for him to kill them with fully functioning jets lets say the planets gravity makes his jet's work at half capacity so he can only go about 20 metres in the air.
__________________ "damn jinzin, you're a real trooper, you provde fact after fact and pages and pages of proof and these wanton miscreants just keep at it"~MERC
I think the War Machine armor would make quick work of the hive or the Plastic Ghost armor could do the same only with a more stealthy approach, but just about any of the more modern armors should be able to take them down without too much trouble.
__________________
Carl - "No, the real point is: I don't give a damn."
Carl - "This line, here? Line of Death. You cross it, and your freedoms no longer exist. Um-kay? Have a good day."
He's got nanomachines in his body that allow him to access his personal network through his own mind. He can operate any of them like that if he wants.