Airplane losing height

In an airplane the captain told the passengers: "This is your Captain speaking. We are losing height and we do not have fuel enough for reaching land. Therefore, we have to let all baggage leave the airplane." The airplane got height again.

Half an hour later the airplane lost height again and the captain was on the loudspeakers once more: "This is your captain speaking. We are still losing height, and we can not reach land without having some passengers to leave the plane. It is a bad situation but we will do this in an honest and democratic way - we will use the alphabet - starting with A. "

"Are there any African passengers?"
No one answered.
"Are there any Black passengers?"
Still no one answered.
"Are there any Coloured passengers?"

Still no one answered but back in the airplane a little boy asked his father: "Dad, you have always told me to be honest. We are both from Africa and have black coloured skin."

"Yes, my son. That is right. But today we are Niggers"