HomeGamesUpdatesPricingMethodology
Steam News12 July 20261mo ago

v20.2-pre1

v20.2-pre1 This is a preview patch, so you must be on the PREVIEW branch to try it. Changes Congestion is now measured only against the queue capacity of airlines who actually operate at the airport.

In this update4

Full notes

Full Puffin Planes update

Read the full published notes in a cleaner layout. The original post stays linked below.

What changed

0 fixes1 addition3 changes0 removals
  • Balance
  • Gameplay
changedChangesCongestion is now measured only against the queue capacity of airlines who actually operate at the airport. Since congestion drives demand suppression, expect stronger suppression at hubs now. This will change how the game plays, so feedback appreciated here.
changedChangesThe Congestion tooltip now shows each queue's fill against its own capacity (for example 208/204, overflowing) instead of its share of all queued passengers.
changedChangesImproved changelog
addedExperimentalExperimental mod support (proof of concept, may break in future updates). You can drop JSON files into the Mods folder next to your saves to add custom airports and plane models to new games.

Puffin Planes changes

changedCongestion is now measured only against the queue capacity of airlines who actually operate at the airport. Since congestion drives demand suppression, expect stronger suppression at hubs now. This will change how the game plays, so feedback appreciated here.
changedThe Congestion tooltip now shows each queue's fill against its own capacity (for example 208/204, overflowing) instead of its share of all queued passengers.
changedImproved changelog
addedExperimental mod support (proof of concept, may break in future updates). You can drop JSON files into the Mods folder next to your saves to add custom airports and plane models to new games.

v20.2-pre1

This is a preview patch, so you must be on the PREVIEW branch to try it.

Changes

  • Congestion is now measured only against the queue capacity of airlines who actually operate at the airport.

    • Since congestion drives demand suppression, expect stronger suppression at hubs now. This will change how the game plays, so feedback appreciated here.

  • The Congestion tooltip now shows each queue's fill against its own capacity (for example 208/204, overflowing) instead of its share of all queued passengers.

  • Renamed "Throughput usage" to "Boarding throughput" to clarify that it specifically measures how fast that passengers who are already at an airport can board their planes.

  • Improved changelog

Experimental

  • Experimental mod support (proof of concept, may break in future updates). You can drop JSON files into the Mods folder next to your saves to add custom airports and plane models to new games.

Adding new planes

Create a file in the folder named

*.models.json

(replace * with something you choose) and follow this format:

{ "AirplaneModels": [ { "Name": "Nano", "Manufacturer": "Sawtelle", "Description": "A very small plane.", "Capacity": 30, "Speed": 300, "Range": 800, "Cost": 6000, "FuelEfficiency": 1.10, "LaborUnits": 100, "Size": "Small", "ComfortBonus": -1, "Prerequisites": [] } ] }

Adding new airports

Create a file in the folder named

*.airports.json

(replace * with something you choose) and follow this format:

{ "AirportDefines": [ { "Name": "Santa Catalina", "Country": "United States", "Population": 4000, "Offset": -7.0, "LatLon": [ 33.36998071192645, -118.42445465228586 ], "IgnoreCountry": false, "RegionOverride": "Western U.S.", "Neighborhoods": [ "Avalon", "Two Harbors", "Pebbly Beach" ] } ] }

Source

Steam News / 12 July 2026

Open original post

Changelog.gg summarizes and formats this update. How we read updates.