Delta Air Lines improved its on-time arrivals in 2011 to rank fifth out of 16 airlines, compared to 15th out of 18 airlines in 2010. "It's more of a symphony of movement out there that lends itself to an on-time departure," said David Holtz, Delta's vice president of operations control. The carrier implemented a scripted process for boarding flights, focusing on morning flights to prevent cascading delays throughout the day.

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