for which cities it works&

I don't like the single supplement charge of about 20% more on top of the price. I would be more interested if you could get around this by working with travel partner services, or offer some kind travel partner feature yourself.

You have just copied the whole page of waynabox.com the original idea. At least you could work a little bit and make your own codes, colours and pictures. Go tell everyone you are stealing codes...so bad.