I am trying to buy MEX - CGK - SFO but the fare is $1000 more expensive than getting a MEX - CGK - (transit SFO) - MEX. Can I buy MEX - CGK - MEX but when I transit in SFO, I throw away the last segment SFO - MEX since I need to go through immigration and pick up my luggage anyway? I am entering the US with a tourist visa.