This question already has an answer here:
I have a flight with 3 stops, the last one in Atlanta, before I arrive at México.
I was planning to stay a couple days in Atlanta, so I won't use the last connection.
Since the cost to change the ticket is expensive I would rather to buy a new ticket just from USA to Mexico.
My question is, should I notify to the airline about this? Immigration in USA could see this action like suspicious?