Beyond Brussels, the main cities Thalys trains reach are Antwerp, Rotterdam, Amsterdam, Liège, Aachen and Cologne. Trains to these destinations run partly on dedicated high-speed tracks, and partly on conventional tracks shared with normal-speed trains. The high-speed lines used by Thalys are HSL 1 between Paris and Brussels, HSL 4/HSL-Zuid between Antwerp and Amsterdam, and the HSL 2 and HSL 3 between Brussels and Aachen. For its seasonal operations within France, other high-speed lines are used. Journeys from Brussels (Brussels-South) to Paris (Gare du Nord) are normally 1 hour and 22 minutes, for a distance of approximately . The peak service speed is while travelling a dedicated high-speed railway track, which is typically electrified at 25 kV AC OHLE. The ligne à grande vitesse (LGV) link with Charles de Gaulle Airport allowed Air France to withdraw its air service between Paris and Brussels; instead, Air France books seats on Thalys trains. Thalys has been given the IATA designator 2H. This is used in conjunction with American Airlines and Delta Air Lines. American Airlines has a code-sharing agreement with Thalys for rail service from Charles de Gaulle airport to Brussels-South. The airline alliance SkyTeam also has a code-sharing agreement with Thalys for rail service connecting its hub Amsterdam Schiphol Airport with Antwerp-Centraal and Bruxelles Midi/Brussel Zuid. Thalys and the Dutch flagcarrier KLM jointly collaborate on AirRail, an initiative to encourage passengers to travel by train to connect with KLM flights; this effort led to KLM ending its air route between Brussels and Amsterdam. Market Thalys targets a passenger market in France, Belgium, the Netherlands, and Germany. The percentage of income coming from different routes demonstrates on which routes the company is most used: Paris-Brussels: 55.6% Paris-Belgium (outside Brussels): 8.9% Paris-Belgium-Netherlands: 21.3% Paris-Belgium-Germany: 11.8% Others: 2.4% 52% of customers are from the leisure market, while 48% are from the business market. A large segment of Thalys's total sales and income comes from the connection between Paris and Brussels. Unlike many national train companies, Thalys does not allow children below 12 years old to travel alone. Children onboard Thalys services must be accompanied and possess appropriate travel documents as required by the relevant national authorities pertaining to the journey being made. Since 24 August 2010, there has been a supplement of €7 to Thalys (as well as other international high-speed tickets) tickets bought at SNCB/NMBS ticket offices at train stations (but not on