Beauty Queens: Mix of Humor and Morbidity

This book is wickedly funny.  Commercial breaks, the girls' extreme personalities, and the ridiculous situation all contribute to the hilarity.  But at the same time, readers are left with a lot of questions about the airplane passengers who didn't survive the crash.  Not a lot of attention is given to the non-survivors; they're more or less forgotten.  While this could be very confusing, disappointing, or disjointed in some books, in this one it really works.  Why do you think it works?  How was the author able to pull it off?  Hint: there's no right or wrong answer!  Just wondering what made it "okay" for you as a reader to laugh at the book despite the fact a bunch of people died in it.