A Wednesday Quiz

Terminal 5 is an elegant building, but I'll leave the detailed reporting to others. I'd rather focus on the quirky, like yesterday, or this "interactive" installation. On a wall just outside the terminal (in position that means few may notice it) is this wall, with sequentially flashing lights. BUT.... how many of the 3-letter airport codes from around the world can you translate (without the Internet)? The full list is: ALT, TUN, VIE, FRA, MIL, WAS, KIN, DEL, TLV, ACC, SOF, IST, GVA, LOS, SEL, PRG, SJO, WAW, NCE, PIT, CAS, HAV, SEA, BJS