A rare grumbling is heard. Or seldom is heard a discouraging word at least at Southwest Airlines. But the airline's pilots union seems to have joined their cross-town counterparts at American Airlines in criticising their management. But there's a big difference: the Allied Pilots Association at American is making its very loud grumblings in any forum it can find. But over at Southwest, what dissatisfaction there is comeswithin the family, as it were: on the corporate blog.The Southwest Airline Pilots Association and indeed other LUV employees have used the Nuts About Southwest blog to jump on the airline's plans for a code share with Mexico's Volaris. Says one, "As an employee, I'm disgusted with the continued outsourcing of our jobs. I guess the company loves us all, unless they can find someone to do the job that we could do for cheaper. This is just one step closer to 'Southwest the travel agent,' not 'Southwest AIRLINES.'"