Saudis land at Aden airport

A Saudi soldier stands guard at the international airport of Yemen's southern port city of Aden, July 24, 2015. Two Saudi aircraft landed at Aden bringing equipment needed to re-open the city's airport four months after the Yemeni civil war shut it down. REUTERS/Faisal Al Nasser

A Saudi soldier secure the international airport of Yemen's southern port city of Aden, July 24, 2015. REUTERS/Faisal Al Nasser

A Southern Resistance fighter stands guard at the international airport of Yemen's southern port city of Aden, July 24, 2015. REUTERS/Faisal Al Nasser

A Saudi soldier stands guard as servicemen on a Saudi military cargo plane prepare to unload aid at the international airport of Yemen's southern port city of Aden, July 24, 2015. REUTERS/Faisal Al Nasser

A Southern Resistance fighter is pictured through a damaged door glass as he stands guard at the international airport of Yemen's southern port city of Aden, July 24, 2015. REUTERS/Faisal Al Nasser

Southern Resistance fighters are seen at the international airport of Yemen's southern port city of Aden, July 24, 2015. REUTERS/Faisal Al Nasser

A Saudi military cargo plane is seen at the international airport of Yemen's southern port city of Aden, July 24, 2015. REUTERS/Faisal Al Nasser

A Southern Resistance fighter stands guard at the damaged international airport of Yemen's southern port city of Aden, July 24, 2015. REUTERS/Faisal Al Nasser

A Southern Resistance fighter stands guard at the damaged international airport of Yemen's southern port city of Aden, July 24, 2015. REUTERS/Faisal Al Nasser

Workers unload aid shipment from a Saudi military cargo plane at the international airport of Yemen's southern port city of Aden, July 23, 2015. REUTERS/Stringer

Workers remove debris from the international airport of Yemen's southern port city of Aden after Southern Resistance fighters took control of it, July 15, 2015. REUTERS/Stringer

Southern Resistance fighters check the wreckage of a destroyed Boeing 747 plane at the international airport of Yemen's southern port city of Aden, July 15, 2015. REUTERS/Stringer

Southern Resistance fighters ride armoured personnel carriers at the international airport of Yemen's southern port city of Aden, July 14, 2015. REUTERS/Stringer

A Southern Popular Resistance fighter hides behind soldiers as they aim their weapons at Houthi positions around the airport of Yemen's southern city of Aden, May 3, 2015. REUTERS/Stringer