!!!Yemen: Transportation ||National air transport system|''number of registered air carriers'': 2 \\ ''inventory of registered aircraft operated by air carriers'': 10 \\ ''annual passenger traffic on registered air carriers'': 1,387,999 \\ ''annual freight traffic on registered air carriers'': 0 mt-km (2015) \\ ||Civil aircraft registration country code prefix|7O (2016) ||Airports|57 (2013) ||Airports - with paved runways|''total'': 17 \\ ''over 3,047 m'': 4 \\ ''2,438 to 3,047 m'': 9 \\ ''1,524 to 2,437 m'': 3 \\ ''914 to 1,523 m'': 1 (2013) \\ ||Airports - with unpaved runways|''total'': 40 \\ ''over 3,047 m'': 3 \\ ''2,438 to 3,047 m'': 5 \\ ''1,524 to 2,437 m'': 7 \\ ''914 to 1,523 m'': 16 \\ ''under 914 m'': 9 (2013) \\ ||Pipelines|gas 641 km; liquid petroleum gas 22 km; oil 1,370 km (2013) ||Roadways|''total'': 71,300 km \\ ''paved'': 6,200 km \\ ''unpaved'': 65,100 km (2005) \\ ||Merchant marine|''total'': 5 \\ ''by type'': chemical tanker 2, petroleum tanker 2, roll on/roll off 1 \\ ''registered in other countries'': 14 (Moldova 4, Panama 4, Sierra Leone 2, Togo 1, unknown 3) (2010) \\ ||Ports and terminals|''major seaport(s)'': Aden, Al Hudaydah, Al Mukalla \\ ||Transportation - note|the International Maritime Bureau reports offshore waters in the Gulf of Aden are high risk for piracy; numerous vessels, including commercial shipping and pleasure craft, have been attacked and hijacked both at anchor and while underway; crew, passengers, and cargo are held for ransom; the presence of several naval task forces in the Gulf of Aden and additional anti-piracy measures on the part of ship operators reduced the incidence of piracy in that body of water