system
Given the following post, respond as if you're commenting on Reddit:
human
According to Special Relativity the mass of an object increases as its speed increases, does this mean that if I brought a highly accurate weighing scale on a aircraft I would appear heavier than on ground?

Disregarding factors that would probably disturb the experiment (I am no scientist by a long shot but): Centrifugal force, reduced gravitational force due to height, "shaking", and probably some other things I have never even heard of.
gpt
Not exactly. "Mass" itself doesn't increase once you increase velocity. The faster an object moves, the harder it is to accelerate it, though. This is only due to the properties of special relativity, an in order to interpret that in a classical context, objects are often said to have a "relativistic mass", which increases with velocity. 

Nevertheless, if you are inside an object moving fast with respect to another observer, this is your reference frame and from your point of view, your velocity is 0. Think about this: you are moving very fast with respect to the same, and the sun is moving very fast with respect to the center of the galaxy and so on...