Originally Posted by
lomapaseo
It's up to the pilot to decide if what a passenger sees is ice/snow accumulations on the wing upper surface. The passenger can report what they see but are not expected to be able to over-rule the crew. The photos above don't convince me one way or the other. Nor would I attempt to argue it further once reported to the crew.
No but they can ask to be offloaded if not convinced by the answer, That might pressure the crew enough to do the right thing...