He was already aboard the plane.

他已经登机了。

《牛津词典》

Everyone was soon aboard the plane.

大家很快登上了飞机。

youdao

Jack has gone aboard the plane.

杰克已上飞机了。

youdao

Airline officials said 16 people, including three crew members, were aboard the plane, operated by Merpati Nusantara airlines.

VOA: standard.2009.08.02

Once aboard the plane, you need to figure out where to stow the check.

FORBES: Connect

Two executives of Michelin, one of the world's leading tire manufacturers, also were aboard the plane, a Michelin spokeswoman said.

CNN: Former royal, Riverdance star among plane's missing

Also believed aboard the plane were her publicist, Arturo Rivera, her lawyer, makeup artist, Jacob Yebale, and the flight crew.

CNN: Jenni Rivera is mourned, but still inspires