An airport official said a small truck blew up at an outer gate to the airport, while a local official and two security sources said the vehicle was carrying petroleum products.
The blast was strong and was heard across the city. Nearby residents' windows were smashed.
Aden is the temporary home of Yemen's internationally-recognised government.
But tensions have also for years simmered within Aden itself between the government and southern separatist groups.
The government and the Southern Transitional Council (STC) are nominal allies under the Saudi-led coalition.
Earlier this month a car bomb in Aden targeting a convoy carrying the city's governor - an STC member - killed at least six people and wounded others. The governor survived.
Instability in the south complicates United Nations-led peace efforts to end the war in Yemen, which has killed tens of thousands of people and left 80% of the population needing help.
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