P/E Ration comparing to Southwest Airlines

Paper instructions:
You need to find results for DELTA AIRLINES
a) Cost per mile for Pilots comparing to Southwest Airlines
b) Cost per mile for Fuel comparing to Southwest Airlines
c) What significant change happened during year 2013?
d) P/E Ration comparing to Southwest Airlines
e) Impact of replacing fleet in order to improve fuel efficiency

THIS INFORMATION NEEDS TO BE FOR THE YEAR OF 2013