There are two main forms of entry from Mexico into the United States: over one of many land gateways at the U.S.-Mexico Border, or via airliner.Land gateways are found on several cities along the border, including those on San Diego, Calexico, El Paso, Eagle Pass, Laredo or Brownsville.Several air routes fly between Mexico and the United States, including destinations such as Los Angeles, San Francisco, Houston, Dallas-Forth Worth, Miami, Orlando, Newark and Detroit.