| Article ID: | iaor19911334 | 
| Country: | United States | 
| Volume: | 21 | 
| Issue: | 1 | 
| Start Page Number: | 189 | 
| End Page Number: | 195 | 
| Publication Date: | Jan 1991 | 
| Journal: | Interfaces | 
| Authors: | Anbil Ranga, Gelman Eric, Patty Bruce, Rajan Tanya. | 
Crew-pairing optimization, the most important and computationally intensive part of crew assignment, contends with union and FAA work rules and pay guarantees to arrive at a low cost solution for assigning crews to fly a monthly schedule. The trip reevaluation and improvement program (TRIP) generates annual savings in excess of $20 million. Considered the pre-eminent solution mechanism for problems of this type, TRIP has been sold to 10 major airlines and one railroad.