I am hopeing someone can help me with this...In 5 weeks I will be flying with UA to Lax from Melbourne via Sydney & via SFO with a 3hr layover. When we get off at SFO to catch UA domestic flight for our last leg of journey to LAX.. will I have to collect my luggage and go thru customs & recheck it in at SFO or will I collect my luggage at LAX and then continue on thru customs??