I was reading Barron's this weekend and there was an article about why Chinese Airspace is so crowded resulting in huge delays and excess fuel burn. It basically discussed the difference in regulations between China and the western nations like tail to nose distance, vertical separation, horizontal separation etc.
In passing, the author mentioned that to avoid the long delays because of congestion, business passengers between HKG
prefer to take the 0325 flight eventhough it is a cargo plane and departs at an inconvenient time. This way they can beat the congestion and apparently this flight has a good track record on punctuality.
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I was surprised to know that Cargo flights carry passengers as well. Is this normal with other airlines?