Airline Ticket Booking & Seat Selection

Data Flow Diagrams (DFD) · made in Skemio

Data flow diagram illustrating airline seat selection, TTL inventory locking, payment gateway authorization, and ticket issuance.

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What it shows

Temporary seat locks prevent race conditions during ticket checkout.
Payment gateway webhooks confirm funds before ticketing state finalizes.
Expired TTL locks return unpurchased seats back into the available pool.

The takeaway

Distributed TTL locks prevent double-booking during asynchronous payments.

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