The fleet assignment problem (FAP) assigns the type of airplane at each flight segment. Since airplane is an expensive resource, poor fleet assignment can cause a great increase in costs of airlines. There are so many consideration which should be tackled in formulation of a FAP problem, especially the parameters regarding to the airplanes. This paper presents a novel, mixed integer programing ...

Airline schedule development continues to remain one of the most challenging planning activity for any airline. An airline schedule comprises of a list of flights and specifies the origin, destination, scheduled departure, and arrival time of each flight in the airline’s network. A critical component of the schedule development activity is the choice of flight block-times, which depend on sever...

The airline industry has a long history of developing and applying optimization approaches to their myriad of scheduling problems, including designing flight schedules that maximize profitability while satisfying rules related to aircraft maintenance; generating cost-minimizing, feasible work schedules for pilots and flight attendants; and identifying implementable, lowcost changes to aircraft ...

Over the last 10 years there has been a tremendous growth in air transportation of passengers. Both airports and airspace are close to saturation with respect to capacity, leading to delays caused by disruptions. At the same time the amount of vehicular traffic around and in all larger cities of the world has show a dramatic increase as well. Public transportation by e.g. rail has come into foc...

Airline operations depend on the complex control of many expensive, tightly-constrained, interdependent resources such as crews and aircraft. Operations research (OR) has played an important role in developing planning tools for this complex system. In recent years, however, the already intense pressure on the airline industry has dramatically increased due to rising fuel costs, competitive pri...

The authors thank the referee for the constructive and helpful comments. Our detailed replies to the referee 2’s comments (in Italic) are given below. Anonymous Referee 2 This manuscript discusses an important topic, the contribution of ion-induced nucleation on atmospheric new particle formation. It is well-written, and in its current form, discreet, compared to the original manuscript. It is ...