Seems like you can get it in 120 fps 2D, from Wikipedia:

> To accommodate the film's wide release, various additional versions of the film were created.[3] They include 120 fps in 2D and 60 fps in 3D as well as today's current standard of 24 fps. The film also received a Dolby Cinema release, with two high dynamic range versions that can accommodate 2D and 3D, with up to 120 fps in 2K resolution.

https://en.wikipedia.org/wiki/Billy_Lynn%27s_Long_Halftime_W...

I thought that was 2 * 60fps stereoscopic (which technically is 120fps so there's no false advertising, just not in the same way as Showscan is 60fps). I'm also not aware of any way to watch it in 2 * 60fps if you missed the original showings.

Maybe you know something I don't, but as far as I can tell it was shot on Sony F65s running at 120fps.

Looks like I was mistaken and a non-interleaved 120fps version exists. Disappointing that there's apparently no way to actually watch it.