This is the first video in mock guesstimate series brought to you by Consulting and Strategy Club, IIM Lucknow where candidate is estimating number of flights taking off from Lucknow airport in a day.
The notes on the side of the screen really helps understand a lot. Excellent video. It helped me a lot. Can you please do a guesstimate on online orders from zomato or swiggy?
Hello Team, it was a good pass at the guesstimate. Kudos from a fellow alumnus. Additional factor for sanity check of the numbers you come up with. If Lucknow has only one runway and it takes 15 minutes for one plane to land or takeoff. And since airport is operational for 20 hours, total take off and landings possible are 20X4 = 80 (takeoffs & landings) = approx 40 takeoffs. While based on boarding Gates constraint is giving you 3 times the number. Although the number is not important, you need to consider and communicate this factor to the interviewer.
@@anirbanchoudhury231 most airports in india with two runways have intersecting runways preventing two take offs simultaneously and there are constraints with the ground support resources like the air traffic tower and taxi lanes preventing the same.
I dont think it takes 15 mins for landing and taking off, maybe around 6 mins would be a good guess (3 mins of take-off - time spent on runway to gain speed and take-off, plus 3 mins buffer before the runway can be safely used again for landing / taking off) Based on this - 20 * 10 = 200 flights take off / land ~ 100 take offs
One factor that also we can check is the weather factor. If we are having a bad weather on that day then the no. Of flights taking off would be very less. Although mostly we consider sunny day in such scenario but we should also discuss this point with the interviewer.
The video is very informative and the perspective and approach used were excellent. Best things about the whole guesstimate question is the thought process of a person which you guys portrayed fabulously. Please make some more videos on guesstimate as well as some mind exercising questions which will help develop though process of an individual watching the same. Thank you 👍🏻👍🏻👍🏻
Not entirely sure about the layover part. The boarding gates are used for layover flights aswell. A flight has a layover only when passengers need to board at the airport. Shouldn't that have been included in the 8 hours too instead of marking up ?
We have 5 runways. 1 flight takes 50 mins ( round off to an hour). So 5 runways 5 flights in an hour. 24 times 5 = 120. 120 flights in a day. Add or minus flights here.
we can have another approach like in peak hours we can assume that in every 10 minutes one flight takes off SImilarly we can scale down for non peak hours
Hello Club Members, Thank you for such to the point and clear presentation, it's a great learning resource. I have just two questions to clarify: 1) He asked the question about passenger, cargo, domestic and international flights, but he did not factor it while structuring and calculating, so will it be useful on that part as it may so happen that interviewer might question that later?? What does your experience say, please share? 2) Why layover flights were considered separately? as they function in the same way as regular flights and even if during layover the passengers are shifted, then they must not be considered for the take-off right as a normal passenger plane?? Hope I'm clear on my question, thanks again!!
I believe what they are referring to are "Stopover" flights which only stop momentarily at the airports for refueling or other operational reasons and hence do not require boarding gates to operate (but a caveat is that the assumption that they constitute 30% of these normal flights sounds like a bit of an overestimation to me, so I could be off track as well)
Hi, I wanted to Know if we can follow the bottleneck approach in this case. Instead of Boarding gates, we can consider the number of runways and the time taken by each flight to take off from the runway. For peak hours, it can run to full capacity and for non-peak let's say 80%
The guy took an approximate time the fight stays at a boarding gate is 45 mins which are 0.75 hours. So from the total number of active hours taken as a metric, we are dividing time associated which each flight to get the number of flights associated at each boarding gate.
