With Hong Kong, Macau, and Shenzhen all in such close proximity, the Pearl River delta airspace is one of the most heavily trafficked in the world. This will give you plenty of options, depending on where you are flying in from and where you want to go. Flying from another mainland city to Shenzhen or Zhuhai is usually cheaper than flying to Hong Kong or Macau. Cathay Pacific out of Hong Kong is one of the best airlines going, and can get you around the Southeast Asia region or farther abroad, while Shenzhen Airlines and China Southern Airlines are quality mainland carriers linking Shenzhen and Guangzhou with many other cities throughout China and across Asia. The major airports are Guangzhou Baiyun International Airport and Bao'an Shenzhen International Airport.