California is served by several major international airports — Los Angeles (LAX), San Francisco (SFO), San Diego (SAN), and Sacramento (SMF) are the main hubs. Amtrak's Pacific Surfliner connects San Diego, Los Angeles, and San Luis Obispo along the coast, while the Coast Starlight runs all the way up to Seattle. If you're driving in, I-5 and US-101 run the full length of the state.