Southwest Airlines’ top executive says the airline is in a position to grow in Las Vegas as the economy gets better but stopped short of promising new flights to McCarran International Airport. Southwest CEO Gary Kelly, in Las Vegas Monday to congratulate local employees for winning the company’s 2009 Spirit Week competition, said he was well aware that his arrival coincided with competitor US Airways’ closure of its pilot and flight attendant bases at McCarran and said his airline — McCarran’s busiest — doesn’t take Las Vegas for granted.