Delta CEO Ed Bastian has a message for competitors who want to start chasing high end travel business: good luck. “It’s really hard to change course,” Bastian says. Rivals are adding more premium seating, bundling products to try to upsell passengers, and investing in free Wi-Fi, but Bastian says they may have trouble catching up to the investments Delta has already made. “We’ve been on this for years,” he says. “We’re not going to change course. If anything, we’re just going to continue to accelerate.”