March 3 (Reuters) - The first commercially operational

launch of Europe's Ariane 6 heavy rocket was postponed for a

second time on Monday, operator Arianespace said on its YouTube

channel.

The launch, designed to carry a French military observation

satellite to orbit, had been due to take place at lunchtime at

Europe's spaceport in Kourou, French Guiana, after a previous

attempt scheduled for February 26 also had to be called off.