During our initial instrument training we were always taught that the final approach fix on an ILS is glideslope intercept. But when I got to my last airline, they told me this is now different. Since usually at big airports you are vectored on to the ILS much higher than than where the OM and multees cross is. And they said your FAF is where it is marked on the Jepp page, at the cross. So which is it for you other 121 guys out there.