An ARJ21, made by Commercial Aircraft Corp of China (Comac), takes off for a test flight during the 9th China International Aviation & Aerospace Exhibition at an airport in Zhuhai, Guangdong province, in this November 16, 2010 file photo.
An ARJ21, made by Commercial Aircraft Corp of China (Comac), takes off for a test flight during the 9th China International Aviation &amp; Aerospace Exhibition at an airport in Zhuhai, Guangdong province, in this November 16, 2010 file photo. REUTERS/Stringer