The 55 - story balloon was scheduled to launch as early as 6 a.m. MDT ( 8 a.m. EDT ) .
Now mission planners say the takeoff wo n't be before 11 a.m. MDT ( 1 p.m. EDT ) .
The 55 - story balloon was scheduled to launch as early as 6 a.m. MDT ( 8 a.m. EDT ) , but now mission planners say the takeoff wo n't be before 11 a.m. MDT ( 1 p.m. EDT ) .