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airport-operations

Transport, logistics and mobility | airport-operations — airport operational systems: AODB, gate and stand allocation, common-use passenger processing (CUPPS/CUSS), baggage reconciliation, FIDS, A-CDM milestones

SITA, Collins Aerospace ARINC MUSE (RTX), Amadeus, Vinci Airports

SystemTechniques · 29Primitives · 86 airport-operations Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›Hot-standby redundancyembedded · medium: A second, always-current controller shadows the primary and takes over within a few cycles of silence; epochs stop the old primary from fighting back.›Assignment problem (Hungarian / Jon…graphs · medium: Optimal one-to-one matching of rows to columns in O(n³) by growing a matching along shortest augmenting paths over dual potentials.›Critical path analysisgraphs · medium: Longest dependency chain in a DAG of timed spans or build actionsBiometric template matchingmachine-learning · medium: Fingerprint minutiae, iris codes and face embeddings: 1:1 verify and 1:N search with FAR/FRR tuningFace embeddingsmachine-learning · medium: Face recognition embeddings trained with margin softmax (ArcFace, CosFace) and threshold-based verificationTime-window feasibilityoptimization · low: Keep earliest/latest start and slack per segment so "does this insertion or move keep every window?" costs O(1) instead of a walk down the sequence.›Interval treedata-structures · low: Index of ranges that answers "which intervals overlap this point or range?" in O(log n + k); static sorted-array form is the compact, cache-friendly choice.›Barcode symbologiesdata-structures · low: Encode/decode 1D and 2D barcodes (Code 128, DataMatrix, QR) with their error correctionHdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesReconciliationfinance · low: Match internal ledger records against bank and processor statements by reference, then amount and date window; every unmatched or mismatched item becomes an exception.›Process supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Iata type b messagingnetworking · low: IATA Type B / SITA telex-style messages for baggage, flight and reservation exchangeMqtt protocolnetworking · low: MQTT pub/sub: topics, QoS 0/1/2, retained messages, sessions and keepaliveServer-sent eventsnetworking · low: One long-lived HTTP response carries text events one way; each event may carry an id, so a reconnecting client names its last one and the server resumes.›WebSocketsnetworking · low: Full-duplex message framing over one upgraded HTTP connection; the standard way to push real-time data to browsers.›Bin packingoptimization · low: Pack items of given sizes into the fewest fixed-capacity bins; sort descending, then first-fit, gives at most 11/9 of optimal and runs in O(n log n).›Mutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Rfid backscatter protocolsignal-processing · low: Passive RFID/DSRC tag interrogation with anti-collision (slotted ALOHA, Q algorithm)Graceful drainingsystems · low: On a termination signal, stop taking new work, finish in-flight work until a deadline, tell clients to reconnect elsewhere, then exit; clients resume from a token.›Hierarchical state machinesystems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.›Publish subscribe event bussystems · low: In-process or on-box topic bus decoupling producers and consumers with bounded queues+ 22 more techniques+ 70 more primitives

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In-house systems

Named systems of this kind at large companies, with their paper or write-up.

ARINC MUSE (Collins Aerospace, shared airport check-in, Sept 2025 cyberattack)RTX