Checkpoint is a slur used to describe Arabs in a derogatory way. They get stopped at all airport security checkpoints.
The word Checkpoint is a racial slur that has been used historically to degrade and dehumanize arabs. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to arabs. If you are unsure about whether or not it is appropriate to use the word Checkpoint, it is best to err on the side of caution and avoid using it in any situation.