There are two more reserved planes plane 15 and plane 16, for private use, where no code point is assigned.

还有两个保留平面，平面15和平面16，用于个别用途，没有分配编码指针。

youdao

There are two more reserved planes plane 15 and plane 16 , for private use , where no code point is assigned.

还有两个保留平面，平面15和平面16 ，用于个别用途，没有分配编码指针。

youdao

The plane was flying normally for about 15 minutes before a warning light blinked on.

飞机正常飞行15分钟后警示灯开始闪烁。

《柯林斯英汉双解大词典》

From under the plane's right wing, the black sharp-nosed X-15 drops free.

VOA: special.2010.07.07

The plane was called the X-15.

VOA: special.2010.07.07

The plane flew 15 parabolas.

CNN: Teachers take weightless ride to inspire students

Craig Quigley said Tuesday the plane had about 15 minutes between the time of the impact and the time it landed on Hainan.

CNN: U.S. pilot struggled to regain control after collision

He flew the X-15 rocket plane to the edge of space - 200, 000 feet up at 4, 000 mph.

MSN: First man on moon Neil Armstrong dead at 82