All hail the laggard! With pretty much every other US-based legacy carrier already on board, we were beginning to wonder if American Airlines even got the memo that in-flight WiFi was in serious demand. At long last, the company has made clear that it plans to equip more than 300 MD-80 and Boeing 737-800 aircraft used primarily in the United States with high-speed WiFi capability (over the next two years). If you'll recall, American announced early on that it was game for trialing the tech, but