US ship joins search for Turkish plane and pilotsA mobile missile launcher is positioned at a military base on the Turkish-Syrian border in Reyhanli, in Turkey's southern Hatay province, Friday. Turkey deployed air defense weaponry along its border with Syria, following Syria's downing of a Turkish warplane over the Mediterranean last Friday. — ReutersISTANBUL — Turkey is to pick a new long-range air defense missile system soon, as tension builds with neighboring Syria, media and foreign diplomats said Friday. Companies vying for the four billion dollar (3.2 billion euro) contract include Raytheon and Lockheed Martin of the United States, Rosoboronexport of Russia, CPMIEC of China and the French-Italian consortium, Eurosam, they said. A Western diplomatic source said a shortlist would be announced on July 11 or 12. The news comes a week after Syria shot down a Turkish warplane, prompting Turkey to start beefing up its forces along their lengthy border with anti-aircraft guns, missile batteries and tanks. The Western diplomat said France had a better chance of winning the order following Francois Hollande's May election in succession to Nicolas Sarkozy, who upset Turkey with plans to make denial of the Armenian genocide a criminal offense. China and Russia are unlikely to secure the contract for Turkey, a NATO member, since they are not part of the alliance, Hurriyet Daily News reported. Turkey also hosts a NATO early warning radar as part of a new defense system aimed at protecting Europe from missiles coming from the Middle East, notably Iran. Meanwhile, Turkey's Foreign Ministry says a US deep-sea exploration vessel will help search Syrian waters for pilots missing from a Turkish military plane shot down by Syria. A ministry official said the research vessel, E/V Nautilus, will set sail from Istanbul later Friday and is expected to join a search for the plane's wreckage early next week. The official said Damascus had been notified that the ship would join the search, and Turkish officials would be on board to coordinate the mission. The official spoke on condition of anonymity in line with government rules. The E/V Nautilus was already in Turkey for an exploration of the Black, Aegean and Mediterranean seas. The downing of the plane has spiked already tense Turkish-Syrian relations. — Agencies