fleet of aircraft than the major airlines with less variety in the type of aircraft additionally the aircraft owned by the regional airlines tend to be smaller than those owned by the major airlines and tend to require fewer maintenance tasks to keep them airworthy because of the smaller scale of the regional airlines they do not have the same manpower and resources of the major airlines to create individualized maintenance programs thus the regional airlines tend to be more concerned with simply gathering all of the information about their maintenance program in one place for that reason mrb program manager 22 and tracking manager 24 are likely the most important components of a regional airline 39 s maintenance management program mrb program manager 22 and tracking manager 24 will provide the regional airlines with the tools needed to organize their maintenance tasks into logical groupings and to monitor those tasks for when they are due at the regional airlines reliability analysis also suffers due to the limited resources available to the regional airlines a reliability program to monitor warranty issues and mrb document modifications is a particularly complicated and expensive program to implement such a program simply requires a large number of resources typically personnel to gather and analyze the large amount of data needed to 1 establish individual parts have met manufacturer 39 s warranty and 2 meet the faa regulations for modifying one 39 s mrb document thus reliability manager 28 can be another key component to add to their maintenance.