What idioms can be used to express Nanjing Lukou Airport?

A sea of ??people:

Pinyin: rén shān rén hǎi

Interpretation: The crowd is like a mountain or a sea. Describes a gathering of people in large numbers.

Source: Chapter 51 of "Water Margin" by Shi Naian of the Ming Dynasty: "Every day, there are those who play, dance, play, or sing, and earn a lot of money." There are so many people watching.”

Example: The park is very lively during the festival.