According to BBC, Chinese air carriers have ordered 50 Boeing 737s worth $4.6 billion! With all the advances and so-called futuristic models on the market, the old trusty 100-200 seat single-aisle aircraft market is supposed to generate $20 trillion. Sometime the old dependable stuff works best.
Read the article @ BBC News - Boeing gets $4.6bn order from China's Shandong Airlines
An aside, Southwest located here in Vegas only flies 737s and the Airbus A320 apparently quite interchangeable. I couldn't tell the difference.