The message contains the aircraft registration number in the header of the message, with the body of the message containing the actual weather information.

邮件包含飞机注册编号的标题中的信息，以电子邮件的正文中包含的实际天气信息。

youdao

Other civil aircraft, the registration of which is approved by the competent civil aviation authority under the State Council.

务院民用航空主管部门准予登记的其他民用航空器。

youdao

On a recent day, four jetliners -- two Boeing 737s, an Airbus A320 and a Boeing widebody 767 -- were parked in the massive Gore hangar, their tail markings and aircraft registration numbers shrouded under plastic to protect the identities of their owners.

WSJ: Demand Soars for Firms That Fit Out Private Jets

On Sunday alone, the aircraft with registration number 5N-RAM was already on its fourth trip of the day and scheduled to make another one.

CNN: Nigerians demand answers in wake of Dana Air crash

The company identified the aircraft, based at Goodwood, as a privately-owned Mark IX version of the famous wartime fighter with the registration G-TRIX.

BBC: Crash scene