Technically, every single one of them, but that relies on the map's size. Also note that the celestial vehicles ar too big and/or powerful to be spawned and so are not there.
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you can do it on custom games , go on race and you spawn and respawn on one
You can't. If you could, it would be in the "Covenant Vehicles" section.
First off, you can either do it in the campaign (New Alexandria) or you can go into the forge mode and spawn a Falcon (Under vehicles). To spawn a falcon go into forge ball ( D-Pad ▲), then press X, after that go to vehicles and choose Falcon. To fly it, hold down LT until you go the height you want. Use the left and right sticks to steer. Hope this helps!
To rotate objects in Halo Reach's forge hold down the left trigger
How to hack halo reach forge online