I'm interested in taking advantage of the $45 offer to add a flight on USH. Unfortunately, I need to book all my travel through my corporate travel website and attempting to book starting at TSS rather than EWR drives the price up much more than $45.
Is it possible to book my flight from EWR (either H or A class, haven't figured out which I'll be taking) on my corporate site and then call CO to add the USH segment on for $45?