What is the total dry ice limit per aircraft for Delta Airlines?

The total dry ice limit per aircraft for Delta Airlines being 77 lbs is rooted in safety regulations and operational guidelines established by the airline and in compliance with federal aviation regulations. This limit is designed to ensure that the dry ice, which sublimates to carbon dioxide gas, does not reach a level that could compromise the cabin's air quality or create a hazardous environment.

In the context of this limit, it is essential for airlines to balance the transportation of perishables or medical supplies that require dry ice with the need to maintain safe cabin pressure and air composition. Exceeding this limit could potentially lead to buildup of carbon dioxide within the aircraft environment, which could pose health risks to passengers and crew members.

The other options are either too low or exceed regulatory guidelines, thus not aligning with the established limit for Delta Airlines. This value helps ensure safety while allowing for practical transportation of items requiring refrigeration.