Excess baggage means that portion by which the checked baggage and carry-on baggage exceed the free baggage allowance specified by Xiamen Airlines.

逾重行李是指托运行李和非托运行李中超过厦航规定的免费行李额的部分。

youdao

Baggage states: first-class 40 kg of checked baggage free of charge, business class 30 kg.

行李规定：免费托运行李头等舱40公斤，公务舱30公斤。

youdao

The airline does offer two free pieces of checked baggage, so there's no need to fight over overhead space unless you need it.

CNN: Southwest charges extra to board first

One example: NPS influenced JetBlue's choice to offer customers one free checked bag when rival carriers began instituting baggage fees.

WSJ: What United, American, Delta, Southwest, JetBlue, Alaska, Virgin America Airlines Learn From Customer Surveys