The job of check-in clerks at any airport is not a particularly interesting or satisfying one. They simply have to check the tickets of passengers, and take their luggage. The work is mechanical, repetitive and very tiring. The only variation in the routine occurs when things go wrong — when flights are delayed or when they are cancelled due to such things as bad weather, strikes or technical problems. Then the check-in clerks are in the unfortunate position of having to face the angry passengers though the fault is not theirs and they can do nothing to put things right.