some of those guys seem to be talking about what he used live, but fair enough.
I had read he used mxr 117 flanger, which is a very musical effect (same one van halen used a lot). It's not one of those real airplane swooshy flangers at all. It has settings on it that sound like chorus, but it wouldn't surprise me at all if he had a dedicated chorus in his rig too.
anyway, it sounds like the way he used it was only in certain spots to make certain notes pop out with that metallic "zing" sound. I can respect that.
There is certainly some crossover in sound between chorus and flanger though, so in some places where I'm hearing flanger it could actually be chorus. the mxr stereo chorus is also very nice. sounds like he could have used phaser on some of the clean parts but without listening to the tracks again i can't put my finger on it.
btw, the 117 flanger used the SAD1024 chip which is now out of production and very difficult to find. I built a diy one that is adapted for mn3007 chips (it's called the collosalus over at madbeanpedals), and it sounds freaking awesome.