NDJAMENA (AFP) -- An elderly Belgian pilot arrested over a charity's attempt to fly 103 children out of Chad returned home Saturday, leaving six Europeans and four Chadians still in jail over the operation.

Jacques Wilmart, 75, left the capital Ndjamena on a Belgian military plane with medical facilities a day after he was freed along with three Spanish colleagues. Wilmart had been hospitalized late Thursday for heart problems.
He arrived back in Belgium on Saturday evening.
Before leaving the Chadian capital, Wilmart said he did not regret the operation by the French charity Zoe's Ark that led to the arrests of 17 Europeans and four Chadians on charges including attempted child abduction.
""I followed my conscience,"" Wilmart told France 2 television. ""You can't have regrets when you have an ideal ... never. They can put people in jail but they can't take away their ideas.""
In Brussels, members of his family were present to meet him on the tarmac.
""The only real drama,"" he said, was what had happened to the children.
Zoe's Ark caused an international outcry when it tried to fly the 103 children aged between about one and 10 to France, where foster homes awaited them. The flight was stopped and the first arrests made on October 25.
The group has maintained throughout that its aim was to rescue children it took to be orphaned by the conflict in the Darfur region of Sudan, across Chad's ethnically strife-prone eastern border.
Aid staff from international agencies who have since cared for the children learned that almost all came from the Chad side of the border and have at least one living parent.
French President Nicolas Sarkozy traveled to Chad last Sunday to collect three French journalists and four Spanish air hostesses detained over the operation. Six Zoe's Ark members and four Chadians remain in jail.
All the suspects, including those released, still face charges ranging from attempted child abduction and fraud to complicity in child abduction. If convicted, they could face hard labor jail terms of up to 20 years.
Lawyers for the defendants are applying to have the charges changed to lesser crimes, which would carry sentences of no more than five years.
French government investigators in Chad will on Sunday begin to probe the circumstances surrounding the operation.
Chadian officials meanwhile are examining whether the Spanish airline company Girjet, from which Zoe's Ark chartered a Boeing 757, was aware of the charity's plans to fly the children to France.
""The way it's started, I don't think the judicial investigation will close rapidly,"" said Jean-Bernard Padare, lawyer for the four Chadians.
Chad is home to about 270,000 refugees from Sudan's war-wracked Darfur region.
Camps also house hundreds of thousands of Chadians displaced by ethnic conflict and insurgency in the east of their own country near the border.