Ex-Bain consultant, got offers from McK, BCG, Bain. Now a startup strategist
Book a coaching

Calculation Airport Passengers in 1 year

Franziska asked on May 17, 2017 - 1 answer

Hi everyone,
I was recently asked to calculate the passengers of an airport in 1 year. I used the method of what I assume would be the bottom-up approach: # of runways, utilization of runways, opening hours airport, # of planes on runway, capacity planes and utilization of planes, etc. I got pretty close to the exact number, so I assume this was a good approach :)
However, could someone please explain to me how the top-down approach would look like? Would I start with the percentage of travellers flying for leisure/work etc.? And how would I proceed then?
Thanks a lot in advance!


replied on May 18, 2017
Ex-Bain consultant, got offers from McK, BCG, Bain. Now a startup strategist

Hi Franziska,

I'd try the following:

1. The population served by a particular airport (if there are several airports in an area, also assume an airport's share)

2. Based on personal experience, estimate the number of people flying for business and leisure (tough)

3. Estimate how many times a year they fly (easier)

As always with these cases, there are many ways to do it and this is just one. Also this top-down approach will be less accurate than what you came up with.

Hope it was helpful!



Related BootCamp article(s)

Getting Up to Speed

In order to repeatedly demonstrate prerequisite skills under the pressure of a real case interview, you need to learn the basics and practice cases.

5 Comment(s)

Important Facts

It's essential to know some key figures regarding geographies, population, economies for your case interviews. We summarized them for you here.

9 Comment(s)

Market Sizing

Market Sizing Cases are used to test your quantitative and reasoning skills. The interviewer evaluates your structure, numbers-handling and business sense.

16 Comment(s)

Related case(s)

Your client, large automotive OEM WyCar, has developed its first fully electric vehicle (EV) and introduced it as a pilot on the Austrian market last year. However, sales have been far below the expected numbers. The management has engaged you to support them in understanding the reasons and advise ... Open whole case

Bain Case: Old Winery

Solved 23.1k times
4.4 5 606
| Rating: (4.4 / 5.0)

You have inherited the “Old Winery” from your grandfather, a winery which has been family owned for five generations and can be dated back to the 16th century. Half of the eleven hectares are used to grow white grapes, the other half to grow red grapes. They are grown in the conventional way, i.e. ... Open whole case

Roland Berger Case: Onlinestar

Solved 12.7k times
4.4 5 255
| Rating: (4.4 / 5.0)

Onlinestar, an online retailer of furniture and garden products (core business), has grown significantly in recent years as a result of an expansion of its product portfolio. The company mainly imports goods from Chinese manufacturers but also operates its own production of cat lavatories (special b ... Open whole case


Solved 45.3k times
4.5 5 1388
| Rating: (4.5 / 5.0) |

Nutripremium is a very well-known premium nutrition food company in Europe (€1 billion revenue last year). It is based in Spain and has an excellent market share not only in its home country but also in Portugal, France, Italy and Germany. Nutripremium has two main lines of products: Vitamin-supp ... Open whole case

Children vaccine

Solved 41.1k times
4.4 5 1333
| Rating: (4.4 / 5.0) |

Beyer, one of the biggest pharmaceutical companies in the world, just invented a very reliable vaccine against Chickenpox, a disease that affects children in the age from 2 to 16 years. Beyer came to you wondering what their potential sales in Europe in the first year would be if they launched this ... Open whole case