Move the jet onto an small aircraft carrier, ferry, or other ship big enough to hold it. Paint a mark on the hull of the ship showing the water level. Then remove the jet. The ship will rise in the water.
Now load the ship with items of known weight (100 pound bales of cotton, whatever) until it sinks to exactly the line you painted on the hull. The total weight of the items will equal the weight of the jet.
Alternatively, you can save effort by computing the volume of the ship between the two water levels, and multiplying that by the density of water.
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If they can stand, just pop them on the scales as you would weigh yourself.
"What is a road lined with scales?"
one step below a light weight Immeasurable with any home scales.
you would weigh it by using grams
When they need an approximate measurement. The scales used to weigh a truckload of gravel are not as accurate as laboratory scales that can measure the weight of a pencil mark on a bit of paper- but extreme accuracy is not needed for the gravel truck.