Thanks @costevens for the welcome! The email from Stanford addresses to "CEAS M.A. Program Applicant" (verbatim). I think Stanford has 2 MA programs, one is the MA in EAS in the Center for EAS (hence CEAS) and the other is the MA en passant to PhD (this one is not in CEAS), if I'm not mistaken. Anyone from Stanford please correct me if I'm wrong. I'm not sure if the process for the FLAS is different for PhD students. Are you applying to the PhD at Stanford? I'm only applying to MA programs this year. And according to the email, the deadline for FLAS is Feb 16, 2018 for Stanford CEAS M.A. applicants, so yes, @lordtiandao, it looks like it differs depending on the school.
As for CU Boulder, I didn't know about it until a very kind PhD student told me about it, and by then it was too late. The deadline already passed for me. Good luck @costevens on your interview!