Every airline, without exception, does this. The airline logic is that the ticket is a contract. If you don't fulfill the terms of the contract, e.g. flying every leg as ticketed, you have breached the contract. The illogical fact is that airline pricing makes absolutely no sense.It's supply and demand pricing, not distance pricing. It's possible that Chicago to Hartford is more expensive than Milwaukee-Chicago-Hartford. They don't want people buying cheaper tickets from a lower price city and then simply boarding at a different city which may be a higher price.
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