United Nations agencies and aid groups have repeatedly called for the airport in Sanaa to be reopened to allow the delivery of desperately needed relief to the millions of Yemenis caught in the conflict.
A helicopter from a Saudi-led Arab coalition had to make an emergency landing in Yemen Friday, a spokesman said, amid reports of a crash in the southern district of Shabwa.
"There was a special military ceremony to receive the bodies of the martyrs on the airport grounds", it added.
A funeral prayer was held for 1st Lieutenant Pilot Jassem Saleh Al Zaabi in Ras Al Khaimah The four died in a helicopter crash due to technical failure. A cholera outbreak has killed more than 1,700 people since April with more than 320,000 suspected cases.
The United States has also been providing arms and military training as well as bombing coordinates to the Saudi-led coalition since the beginning of the protracted war, which has failed to achieve its goals.
Forces loyal to President Abd-Rabbu Mansour Hadi wrested Aden and several southern provinces from the Houthis in the summer of 2015 but have struggled to impose stability and the government still operates mostly from exile in the Saudi capital Riyadh.
The armed Houthi movement and their foes in Yemen's civil war, the Saudi-led coalition, on Saturday gave conflicting accounts of a Houthi attempt to attack shipping in the Red Sea port of al-Mokha.
The jihadists are thought to have moved farther south into neighbouring Abyan province.
"My brother Mohamed Abdul Salam and his two friends Omar Yaseen Abdul Aziz and Mohamed Kahla were enforced disappeared one month ago", Karman, who was awarded the Nobel Peace Prize in 2011, said on Facebook.