https://travel.americanexpress.com/home?inav=menu_travel_book

There are seperate travel options depending on what amex cards you hold. I can either use the personal "book a trip" button or use the business travel button where there are savings due to pre arranged fare reductions. For reimbursed travel I would go through the PR personal travel portal. My small business does not require travel so I have never used the business travel portal.