JFK Tower in Red?

I haven't been at JFK after dark for years but last week I went to pick-up a friend. I noticed the JFK Tower bathed in red lights. Is it always lit red or does the lighting change like the Empire State? I seem to recall it was lit in white originally. When did they add red lighting? If always lit in red now, why red?

It changes colors- I dont thing its for a particular reason like the Empire State bldg.There is red,green and blue

it changed from red to blue to purple when i was there tuesday morning.

I didn't know the JFK Tower changed color too. When I visited LAX at night, the Tower kept changing color,too. Maybe that's where the idea came from.

I believe it changes color to reflect the controller on duty's mood.

So why don't that have "black"