Ask HN: Which merchant banks will allow travel sites?

I've spent the last two hours reading through HN posts and also researching merchant banks and payment processors like Paypal, Google Checkout, and Amazon Payments. Because of the risk associated with chargebacks of large purchases, no one seems to approve businesses that focus on the travel industry. This is odd, because the internet is chock-full of travel sites, so which merchant banks/payment processors are they using? Does anyone have any recommendations for a startup in the travel space?