I did my Oath on Aug 2nd, emailed the form immediately after with details of my passport appointment on aug 22nd and flight on aug 24th asking for expedited mailing. They replied Aug 3rd that I need an email from company to explain how that's traveling for work, otherwise it won't be entertained. I emailed them back end of day with letter from company, and this morning they replied that it's approved and my certificate will be mailed with purolator instead of regular mail. Hope this helps someone