Passengers with hand luggage can go straight to the departure gate to check in there.

携带手提行李的乘客可以直接到登机口办理登机手续。

《柯林斯英汉双解大词典》

You must check your luggage in before noon.

你必须在中午以前将行李交运。

youdao

Using a real life analogy, when you travel by air, you check-in large pieces of luggage and only claim them when you reach a transfer point or your destination.

使用一个真实类比，当您乘飞机旅行时，要签入托运大件行李且只要在到达中转点或目的地时才领取它们。

youdao

Brian McColghan, 64, from Duston, said he made a remark when he could not check his luggage in early.

BBC: Man banned from Easyjet flight for 'joking' about bomb

Air travel has become increasingly annoying and enervating: delayed flights, more restrictive rules on the size of carry-ons (anything bigger than a wallet may force a gate check), delayed or lost luggage, long check-in lines, etc.

FORBES: Fact and Comment

Airport curbside luggage check-in will no longer be allowed.

CNN: Flights still grounded amid security concerns