What is the difference between "check-in counter" and "arrival?

[HeidiS]

English Language Tests, Intermediate level

ESL/EFL Test #158 "Airport and flight travel expressions", question 1

Check-in counters are open two hours before the scheduled flight ......... time.

(a) going
(b) arrival
(c) departure
(d) transit

English Language Tests, Intermediate level

ESL/EFL Test #158 "Airport and flight travel expressions", answer 1

Check-in counters are open two hours before the scheduled flight departure time.

Correct answer: (c) departure

Your answer was: incorrect
Check-in counters are open two hours before the scheduled flight arrival time.
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why is it that word why isnt it arrival?

HeidiS

[Mister Micawber]

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Because the sentence speaks of check-in counters, which are timed to departures, not arrivals.
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Native English teacher at Mister Micawber's