No, the only airline I can think of is ABX (I think it's ABX!) which operates with 13 bid periods of 28 days each. And no, I don't know who get the extra day So, I included 13 bid periods for them.

Thanks for the feedback & remember if you have an idea that will make the site better - please use the "contact" link on the main site and let us know how we can improve.

All the Best - Paul