I booked my flight on JustFly.com and the ticket was $361.60. On the invoice it was $374.55. I called to find out what the difference was. I was told that this was for charges for seat assignment, which I was not able to do while booking since the site said that seating assignment was not available. The airline site had the charge as $361.60 including all taxes and fees. I told the agent at JustFly that I was not able to set my seat assignment so I shouldn't be charged. The people were very rude and refused to remove the charges.
I called my bank to dispute and put in a complaint with the Better Business Bureau -- which by the way has a big warning against using JustFly. The next day I received an email from JustFly saying they received the complaint from the BBB and they apologized for the inconvenience and refunded the seating charges.
I should have checked this company before using and will never use them again. You can get the same price, without any seating assignment charges directly from the airline.
Buyer Beware. Take a lesson from me and check out any company you think of using with a Google search for problems.