Hi, We are going to new york in october, It has been a few years since we were last there and I would appreciate any help, We are flying from shannon in to jfk if that matters, What clearance do we need , For a start I know we have to put in our api details on the aer lingus site, From memory we had to fill in a green form at Shannon also but now I have heard of esta so I am a bit confused , I just need to dot the I,s and cross the T,s and have them out of the way, Thanks in advance for any help. Regards Cumnor.