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Liquids generally cannot be sent via air freight.
ice blocks
You sure about that? Because a lot of logistics companies will gladly tell you how they do. I've shipped liquids by air freight, too. Not a problem as long as the shipper and carrier understand the terms of the contract.
https://commercialfreightservices.com/shipping-bulk-dry-and-liquids-by-air-freight/
https://overseasairfreight.com/our-services/international-courier-service-for-liquid/
https://www.dhl.com/discover/en-hk/logistics-advice/import-export-advice/everything-you-need-to-know-about-shipping-liquids-internationally
Right now, someone somewhere is shipping more than 1000L of something liquid by air freight. Not sure why you think this is some dastardly mystery. You simply weren't aware of how common it is, is all.
It is interesting to me that they do honestly. Liquids shift weight a lot, which can be very dangerous to planes. I wonder how they handle it. Maybe they only put it on planes so big that the weight shift is negligable?
Liquids shift weight based on empty space in the container. Once an aircraft gets to speed, shifts are negligible anyway.
Also, keep in mind that lavatory water and waste systems in a 747 are more than this silly question in capacity. 4 x 416 liter tanks, filled to 405 liters. So very little slack space to start.
https://www.scribd.com/document/678025063/ATA-38-51-52-et-56
Also, aircraft fuel is a liquid. A 747 holds usually more than 200,000 liters of fuel.
The max cargo capacity of a cargo-oriented 747 is 113,000kg. So 1,000 liters of water in a tank with very little slack is both less than 1% of the total cargo capacity, it's also less than even the water tanks for the sinks and toilets on the passenger version. And less than 0.5% of how much fuel is sloshing around in the tanks.
https://www.cargolux.com/fleet-equipment/aircraft/747-400f-specifications/