how many pieces of luggage are unloaded at Boston airport on an average day?
Anybody know how best to answer this market sizing question?
I would break into 3 steps:
1) # of ppl that fly each day
2) # of ppl that fly into Boston each day
3) Assume 1 passenger has 1 bag and get total # of bags
Would do #1 by segmenting into age (younger ppl likely to fly more, older less). Only problem is my logic from getting from step 1 to 2 is pretty shaky. I was thinking about saying Boston's a major city with lots of connecting flights so maybe 5% of all people that take flights go to Boston.
Any other approaches? Thanks.
I would always start any guesstimates with a scoping/clarifying statement question. An example for this would mean “There are 2 types of passengers in an airport, ones in transit and another where Boston is the final destination. Passengers in transit would also require their luggages to be unloaded from their plane to another plane. Would you like me to consider these luggages as well?” Another example could be “I know that Boston has 3 terminals, terminal 2 is the largest terminal and I assumed that terminal 1 is 20% of the size of terminal 2 and terminal 3 is 50% of the size of terminal 3. Would you like me to provide the estimates of all the terminals?” These scoping/clarifying questions provide you yet another opportunity to show the interviewer that you are carefully considering the question before structuring your answer. I will feedback on your answer at a later time.
I would approach it as follows:
Note: obviously you can make it more complicated if you want by adding variations in the sizes of planes arriving (x% are small planes, x% 747s, etc.), adding number of bags being shipped on cargo planes, etc. but i generally try to keep it pretty simple...
if you actually look at Logan's real numbers these guesses are actually not far off...they have 103 gates and ~972 daily inbound and outbound flights --- so our 450 number for arrivals is not bad actually.
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