All Schema files in the OTA specification are made available according to the terms defined by the OTA License Agreement at http://www.opentravel.org/ota_downloads_form.cfm The Availability Request message requests pricing information for specific flights on specific dates for a specific number and type of passengers. Optional information in the message allows fare restriction preferences and negotiated fare contract codes to be included in the message. The pricing request contains the information necessary to perform an availability / sell from availability / price series of entries on an airline CRS or GDS. Point of sale object. The Air Itineraries to be priced Specify passenger numbers and types