Design
Airline Boarding & Seat Assignment System
Design a system that manages flight seat maps, seat selection, boarding groups, and check-in.
This is a Low-Level Design (LLD) problem. New to LLD vs HLD? Start here.
01 - Why interviewers ask this
Seat maps plus boarding groups test whether you can layer a priority/ordering system (boarding groups) on top of a concurrency-safe resource (seats) at the same time.
02 - Where this system exists in the real world
You interact with this design every day.
Airline check-in and boarding systems
Stadium/venue seating and entry management
Train and bus seat assignment systems
03 - What you'll master
Solve this once. Know it forever.
Prevent concurrent seat double-assignment
Model boarding priority/group ordering
Handle standby and waitlist promotion
04 - What you'll design
6 functional · 3 non-functional requirements.
Display a seat map showing available/occupied/blocked seats
5 more requirements inside
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05 - Companies that ask this
You may face this exact question in your next interview.
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