Call sign questions

I listen to Liveatc on my Iphone on the LIRR every morning, there are two call signs I hear at JFK that I am note sure who they are world express ( which is usually a heavy) and the other sounds like A C and they are sometimes a heavy. anyone know who they are?

World Express is DHL.

Thank you Phil

"A-See" is Atlantic Southeast Airlines. They have a CRJ200 which goes to IAD approx 10am Definitely not a heavy.