Drama: Third graders don't have jack on a bunch of adults who feel slighted or that they were owed something they did not receive.
Parked airplanes: Lots and lots of parked airplanes - lots of 747-200, DC-9's, 757's and 767's that are now scorpion habitats out here in Arizona. Parked airplanes ultimately means fewer pilots.
The internal bickering and ridiculous "tug-o-war" that goes on between the divisions.
The "Seniority Electric Slide": Even with a relatively equitable SIL, most of us still took it in the shorts except the #1 guy on the seniority list.
Base closures: Inevitable. How many guys were dug into Anchorage, Memphis, Cincinnati, Honolulu, etc that never thought they would have to commute? Now they're in ATL and ATL's up in JFK. JFK's running to DTW, MSP to ATL and LAX, blah blah blah.
And remember, this was from a merger that was mostly smooth and friendly.