This route map shows high cost, highly congested airports such as San Francisco, Minneapolis St. Paul, and particularly New York Laguardia on the Southwest map that would've been unfathomable under Herb Kelleher. Later in 2009, Boston Logan would be added to as Southwest invades this market as well, which has become an LCC hub in recent years. Many say Southwest's successful challenge of USAirways at Philadelphia is what emboldened the carrier to this type of expansion.