Guesstimate: No. of flights taking off from an airport in a day

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.

[@dhritirajdas6876]

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?

[@AvinashSingh-wo9rs]

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]

Can't there be more than just 1 runway?

[@rajharsh33]

@@anirbanchoudhury231 There can be, but specifically speaking about Lucknow, there is only one.

[@tadarsh8128]

@@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.

[@mayanktyagi1932]

Why would it take 15 min it can also take lesser time like even less than 10 min

[@applepaul]

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

[@Riddheshkotadia]

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 👍🏻👍🏻👍🏻

[@janisharakhtar8075]

Appreciate the help, folks. Thank you.

[@gaganjakhu714]

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.

[@TuringTested01]

Wow his estimate is really good, the number of flights are around 140 per day from lucknow and his estimate is 130. Really good estimate

[@gandlurulakshminarasimhakr9259]

they already know that bro that is why they have landed at the same number

[@rachittyagiyoutube]

Bro one method is regarding creating a formula.. Which one should we focus on demand - supply or formula based ?

[@sravangoud9700]

@@rachittyagiyoutube the one with less assumptions u have to make

[@kenlandon6130]

@@rachittyagiyoutube he used supply because there are only a fixed number of gates

[@ankurjaiswal4294]

It's a great help....keep doing it......respect.

[@kanishkkumar406]

This was very helpful and helped me a lot in preparing for an interview.

[@keshavgupta2009]

Brother had a very calming energy. I think if I can match that, I would be golden for the interviews as I usually tend to panic under pressure.

[@aditidixit7295]

How to decide whether need to pick up the supply side or the demand side approach?

[@ashishkatariya9090]

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.

[@sahilali9875]

5 RUNWAYS??? are you sure?

[@kandpalg94]

Can we use occupancy approach? Suppose we guess an occupancy number of waiting seats inside the airport post to the check-in journey.

[@arindambaruah5419]

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 ?

[@theinfluentialmonk]

y cant we use (no. of runway * occupancy rate of runway)?

[@tokiosingh]

How to calculate the road rollers market in India?

[@rohanbk5923]

Can anyone help to estimate no of professional cricketers in india using demand side or supply side approach

[@prernavadhera3760]

What could have been the approach if the interviewer could have suggested to keep cargo flights into consideration?

[@udayjordan4262]

it was similar approach to that kindof express toll questions

[@manojrangera5955]

Lay over means?..taking 30% of the flight

[@Anshul-gy8su]

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

[@romitrana8631]

Where have you used the information of Domestic & International flights? What could be the difference in approach?

[@ankitchoudhary72488]

Very beneficial

[@LearningBridgeOfficial]

Excellent

[@sumitpallava1938]

The multiplication factor is 1.33 and not 0.75 if you are considering 45 minutes to be the boarding time.

[@kartikayasahu2914]

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!!

[@sudakbhatt]

I have the same doubt as your 2nd point. If anyone knows the answer, please do help.

[@arpita199126]

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)

[@AK47-666]

Where did he come up with demand side approach and supply side approach?? I mean wtf did that even mean??

[@subhamshankar3670]

Why was he taking 45 minutes?

[@kedarnandkhedkar8604]

Won't the return flights engage boarding gates?

[@RishuKumar-yp6zu]

I think Boarding gate wont affect no of passenger at all unless it is taliban like situation

[@harshpataskar8359]

passengers of return flights will use arrival gates rather than boarding gates

[@AyushMaheshwari-fk1qr]

I guess the number of flights taking off will be different on weekdays, and weekends.

[@SS-sy4qw]

Why boarding gates why not runway?

[@venkateshkasat6508]

How 130 came at final ans?

[@azimfaruki1853]

maam can you elaborate why did you divide the hours by 0.75

[@The_Moto_Monk]

45 mins - 1 boarding: 45/60 = 3/4 = 0.75

[@wanderlust4792]

Which tool is used to create the chart, shown on the right side?

[@TarunKumar-ed4ke]

PowerPoint

[@aineshkuadad]

Kaunsi International Flight Lucknow se jaati hai?:/

[@TheVibhuraj]

nepal

[@varshanth9029]

helpful

[@shaleenahuja2107]

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%

[@ajaymeena4628]

from where i have to study for case study .....

[@TravelAndMachines]

Exactly

[@aarushijoshi6355]

this is exactly what I did

[@Ann-mi8fo]

Can you explain how to go about this problem with the bottleneck approach?

[@SuperMsmystery]

@@Ann-mi8fo Manoeuvres time on the runway is around 30 mins.that itself limits it to 48 flights per day theoretically per runway

[@ananyashyamal6675]

why are we dividing 0.75 hours?

[@satwikch7938]

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.

[@harshitsingh5201]

How in the end we can do a sanity check in this guesstimate?

[@MAK335]

google the answer bro

[@TuringTested01]

Wow his estimate is really good, the number of flights are around 140 per day from lucknow and his estimate is 130. Really good estimate

[@daredevil_491]

@@TuringTested01 he knew it before hand

[@rashmi6222]

No insights offered.. anyone cud do this... whts somethng which is diff.???? an edge?

[@walterrwhitee]

The girl's voice resembles Kiara Advani at first glance.

[@achintya1044]

kuch to sharam karo bhaijaan