Speed-alliance is a product of Hahn Air Systems GmbH. It is used by high-speed railway companies to sell their seats via Global Distribution System (GDS) under the two character code 5W. The railway connections are displayed in the airline display of the GDS to be sold by travel agencies worldwide. In addition, travel agencies can combine the train connections with flights of the partner airlines of Hahn Air Lines GmbH on one HR-169 ticket. Hahn Air Lines GmbH is a sister company of Hahn Air Systems GmbH.