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Sam was late (Sam was being late) for his flight because he had parked in

the wrong terminal.

I know they've just arrived. Did they have a good trip?

Someone stole Simon's documents when he waited in the queue
Where was goingTom when he knew the news?

Marta had already left the railway station © when she realized she had lost

her passport.
Our bags were already at baggage reclaim when we were getting there

She said goodbye to her family. Then she went through security and

passport control into the departure lounge.

He had been flying for twelve hours — by the time he arrived in China.

Sure, here is the corrected version of the text:

Sam was late for his flight because he had parked in the wrong terminal. (No correction needed)

I know they've just arrived. Did they have a good trip? (No correction needed)

Someone stole Simon's documents while he was waiting in the queue. (Used "while" instead of "when")

Where was Tom going when he heard the news? (Changed "goingTom" to "Tom" and used "heard" instead of "knew")

Marta had already left the railway station when she realized she had lost her passport. (No correction needed)

Our bags were already at baggage reclaim when we got there. (Changed "were getting" to "got")

She said goodbye to her family. Then she went through security and passport control into the departure lounge. (No correction needed)

He had been flying for twelve hours by the time he arrived in China. (No correction needed)