Canadair planes can float even when full of water.
Water will be ingested because the speed of the aircraft on will force the water in its scoop, pretty much like a [water trough](https://en.m.wikipedia.org/wiki/Water_trough) for old steam trains.
Because the plane is also a boat, when scooping, the pilots will compensate for the extra water weight and maintain ground speed, not by fear of sinking but to have enough speed to keep flying.
Check this (https://youtu.be/fuLk5hXMRZY?si=u02eB1wjt-vXHkKp), it explains things pretty well
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