Tough to know. I work for a low-tier Fortune-500 company and it's been quite a few years that we've been required to use the travel program. With the exception of emergency circumstance, our policy states that air fare booked via another means will not be reimbursed.

There are a few reasons why companies would do this. Travel managment tools:

--Gather and compile data so companies get an accurate picture of how travel dollars are being spent
--Allow better policing of policies, likely reducing travel costs
--Enforce use of preferred travel companies, helping to meet volume tiers for corporate contracts
--Integrate with expense tracking systems to improve efficiency
--Polices usage policies for corporate travel charge cards.

At least that's what's all supposed to happen. And travel management tool companies get paid serious money for this service.

There's really no way of knowing (from our side) what portion of Frontier's travelers are required to use such a travel system. I would guess that smaller companies are far less likely than big ones to have this. Some of those larger companies may or may not have Frontier contracts (we do) and so if they don't they may already not be flying Frontier.

Being MKE-based, the small silver lining in the huge pulldown is that I'm not in a position to worry about the change and the prospect of earning less credit for not being able to book work travel at their website.