This java-based web app allows you to observe the movement of flights and air traffic patterns. Watch animated simulations of flight tracks taken from actual radar data, with about a 10 minute lag time. The site also includes airports such as LAX and JFK. Here are sites for more airports:
JFK
http://www4.passur.com/jfk.html
LAX
http://www4.passur.com/lax.html
and more:
http://www.passur.com/sites.htm
Boca Raton Airport
http://www.bocaairport.com
www.bocaratonairport.com/core_noise.asp
Boston Logan International
www.massport.org/logan/default.asp
www4.passur.com/bos.html
Burbank Airport
www.burbankairport.com/next/index.html
www4.passur.com/bur.html
John Wayne Orange County Airport
www.ocair.com/
www4.passur.com/sna.html
Los Angeles World Airports
Los Angeles International
www.lawa.org
www4.passur.com/lax.html
Ontario International Airport
http://www.lawa.org/ont/
http://www4.passur.com/ont.html
Martin County Airport-Witham Field
http://www4.passur.com/suaSilver.html http://webserver.martin.fl.us/GOVT/depts/mca/
Nantucket Memorial Airport
www.nantucketairport.com
www4.passur.com/ack.html
New Orleans International Airport
www.flymsy.com/
www4.passur.com/msy.html
PANYNJ
John F. Kennedy International Airport
http://www4.passur.com/jfk.html
LaGuardia Airport
http://www4.passur.com/lga.html
Newark International Airport
http://www4.passur.com/ewr.html
Teterboro Airport
http://www4.passur.com/teb.html
San Jose International Airport
www.sjc.org/
www4.passur.com/sjc.html
St. Petersburg-Clearwater International Airport
http://www4.passur.com/pie.html http://www.fly2pie.com/
Westchester County Airport
www.westchestergov.com/airport
www4.passur.com/hpn.html