All well-known Computer Reservations Systems (CRS) and Internet  Booking Engines (IBE):

Computer Reservations Systems (CRS):

www.amadeus.net	www.galileo.com	www.ors.si
www.pegs.com	www.sabre-holdings.com	www.traffics.de
www.webres.de

Internet Booking Engines (IBE):

www.ors.si	www.traffics.de	www.travel-it.de
www.traveltainment.de