The DC-3, are North of the Yemenia Hangar just east of the parllel taxiway. They are not in the military area, so I'm not sure if you'd get harassed for going near them or not.
I poked around over there once, but had a local ID badge.
There are a lot of military ops out of OYSN and they are really sensitive about stuff. It always seems that the more inept the local military, the bigger the deal they make about "national security". So if you take any photos, be discreet or at best some Yemeni with a nice duct taped AK-47 will take your camera. At worst, you'll spend a few days in some nasty holding cell until you can come up with some Riyals as penance for your transgression.
You'll see a lot of craptastic aircraft in Sana'a such as the frighteningly UGLY Kasparov dual helix helicopter, state of the art (1966, that is) SU-23 fighters oh and let's not forget the Presidental 747-SP. Yeah, the President of Yemen need his own ultra long range 747 just in case of a nuclear attack or invasion of Yemen...because every country covets all that Yemen has to offer.
Last year, I saw an IL-76 do a hard landing on 36 that completely destoyed the starboard landing gear. It was hilarious watching them try to taxi it. The wings were bouncing so bad it looked like an albabtross flapping its wings. The SU-23's regulary blow tires on landing and I know they've lost at least 3 of them in the last year.
There's also an old Saudi registered 747 that ws just abandoned on the ramp. Apparetly, it is now a feral cat ranch.
Oh and speaking of abandoned, if you look across the ramp to the west, you'll see the new airport terminal. One day, work just stopped on it.
Oh yeah, if you do decide to take a look at those DC-3's, make sure to take a mask with you. The Sana's wastewater plant is on the other side of the fence. The smell is putrid enough to make your eyes water.
Sana'a - "Where every day feels like a month"