Visa: http://www.koreaembassyusa.org/ 

Airport: Incheon/Seoul International Airport 

Airlines: Korean air (with Delta), Asiana (with United), 

             Singapore air (only from San Francisco)  

Tour: http://english.tour2korea.com/index.asp 

         http://www.airport.kr:80/notice/NoticeList.iia?     

                   functioncode=49&fake=1231541804628 

Cell phone: you can rent a cell phone from the airport. (renting will cost  

                   less than roaming US phones)