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MGMT55142 Operations Management

Question

Answered

Task 

1. Case Study: The North-South Airline

In 2010, Northern Airlines merged with Southeast Airlines to create the fourth largest

U.S. carrier. The new North-South Airline inherited both an aging fleet of Boeing 737—200 aircraft and Stephen Ruth. Ruth was a tough former secretary of the navy who stepped in as new president and chairman of the board.

Ruth’s first concern in creating a financially solid company was maintenance costs. It was commonly believed in the airline industry that maintenance costs rose with the age of the aircraft. Ruth quickly noticed that, historically, there has been a significant difference in reported B737—200 maintenance costs both in the airframe and engine areas between Northern Airlines and Southeast Airlines, with Southeast having the newer fleet.

On November 12, 2010, Ruth assigned Peg Young, vice president for operations and maintenance, to study the issue. Specifically, Ruth wanted to know whether the average fleet age was correlated to direct airframe maintenance costs and (2) whether there was a relationship between average fleet age and direct engine maintenance costs. Young was to report back with the answer, along with quantitative and graphical descriptions of the relationship, by November 26.

First, Young had her staff construct the average age of Northern and Southeast B737- 200 fleets, by quarter, since the introduction of the aircraft to service by each airline in late 2001 and early 2002. The average age of each fleet was calculated by first multiplying the total number of calendar days that each aircraft had been in service at the pertinent point in time by the average daily utilization of the respective fleet to total fleet-hours flown. The total fleet-hours flown was then divided by the number of aircraft in service at that time, giving the age of the "average" aircraft in the fleet.

The average utilization was found by taking the actual total fleet-hours flown at September 30, 2010, from Northern and Southeast data, and dividing by total days in service for all aircraft at that time. The average utilization for Southeast was 8.3 hours per day, and the average utilization for Northern was 8.7 hours per day. Because the available cost data were calculated for each yearly period ending at the end of the first quarter, average fleet age was calculated at the same points in time.

The fleet data are shown in the following table. Airframe cost data and engine cost data are both shown paired with fleet average age.
 

Northern Airline Data

 

Airframe Cost

Engine Cost

Average

Year

per Aircraft

per Aircraft

Age (hrs)

2003

51.80

43.49

6,512

2004

54.92

38.58

8,404

2005

69.70

51.48

11,077

2006

68.90

58.72

11,717

2007

63.72

45.47

13,275

2008

84.73

50.26

15,215

2009

78.74

79.60

18,390

 

Southeast Airline Data

 

Airframe Cost

Engine Cost

Average

Year

per Aircraft

per Aircraft

Age (hrs)

2003

13.29

18.86

5,107

2004

25.15

31.55

8,145

2005

32.18

40.43

7,360

2006

31.78

22.10

5,773

2007

25.34

19.69

7,150

2008

32.78

32.58

9,364

2009

35.56

38.07

8,259

 
*Dates and names of airlines and individuals have been changed in this case to maintain confidentiality. The data and issues described here are actual.

2 . (Independent of the above case)

Explain why such forecasting devices as moving average, weighted moving averages, and exponential smoothing are not well suited for data series but have trends. (3 marks)

MGMT55142 Operations Management

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