Ok in 2x13 a Helicopter was seen flying out of Atlanta, the same one Rick Grimes saw.......ok well in Issue 26 of the Comic Series Rick, Glenn a a few others spotted a helicopter crashing from the prison, the people flying it were taken by the Governer and killed by the walkers. I believe that it will be the same helicopter that was in 2x13 and that's how they will tie the helicopter into the series