Under each sub heading please explain for all. What is the "hedged exposure" of Southwest Airlines Derivatives Instruments? The cost? Gain/loss? Hedging inefficiencies?

IV. Southwest Airlines Derivatives Instruments (40%) 2007 (10%) 2018 (10%) Derivatives and strategies used Hedged exposure Cost Gain/Loss Hedging inefficiencies Discuss Southwest Airlines' strategy change on using derivatives in the past decade. Comment impact factors on hedging strategy change. (20%)