Originally Posted by NYC Flyer

My pleasure--my travel agent and business backgrounds are intrigued! A locally-owned American Express affiliate might make sense (or Travel Leaders, ProTravel, etc...), but I think the corporate-owned Amex Corporate Travel subsidiary would think of this as doing you a favor, not the other way around.

Likely zero until you have built some volume and can negotiate a corporate contract with a preferred carrier or qualify as a tour operator with which an airline would look to negotiate bulk fares (at that point you'd be large enough to necessitate your own in-house air department of some type). However, there are agencies with access to small discounts on certain fares/routes/airlines. These offerings are not widely promoted (as no carrier wants to cannibalize their own sales channels) and generally require a relationship with an agency.