Iraqi TV has shown pictures of men it says are the pilots.
But the US says showing the pictures breaks an important war-law called the Geneva Convention.
It protects prisoners of war from being humiliated or mistreated.
UK officials also said the first British soldier had died in fighting. He was killed in fighting near al-Zubayr, to the south of Iraq's second-biggest city, Basra.
British and US soldiers now think they'll be in the Iraqi capital Baghdad by Tuesday morning. They are said to be at Karbala, south of the city.
But UK Prime Minister Tony Blair warned parliament there were going to be hard days ahead, but the war strategy was going to plan.
Saddam on TV?
Earlier in the day, Saddam Hussein appeared on Iraqi TV saying an Iraqi victory was near.