--- title: "How to use AI on a flight with no internet" description: "Cloud chatbots stop working the moment the cabin door closes. Here is how to set up AI that keeps working for the whole flight, in airplane mode, with no wifi." pubDate: 2026-08-20 author: "Offeline" --- Cloud chatbots stop working the moment your flight leaves the gate, because every reply they give comes from a server you can no longer reach. A language model downloaded to your phone before takeoff keeps working for the entire flight, in airplane mode, with no wifi. Nothing gets sent anywhere, so there is no connection to lose. Flights are the clearest case for local AI. You have several uninterrupted hours, you often have real work to do, and the network is either absent, expensive, or bad. ## Does ChatGPT work on a plane? No, ChatGPT is a cloud service. Each prompt you type travels to a data center, a model there writes the reply, and the reply travels back to your screen. In airplane mode that round trip fails before the model reads a single word of your question, so you get a connection error instead of an answer. Gemini, Claude, Copilot, and Perplexity all work the same way. Having the app installed changes nothing, because the app is only a window onto hardware somewhere else. Any chat history you already loaded may still be readable, but you cannot ask anything new. ## What works instead A model that lives on your phone. You download the file once while you still have wifi, and after that your own chip does the computing. Airplane mode is irrelevant to something that never needed a network in the first place. It is the difference between streaming an album and having it downloaded. This is what [Offeline](/) does: you pick an open-source model from the marketplace, it downloads in the background, and from then on chat runs on the device. No account, no subscription, and no server involved in your conversation. If you want the mechanics of the setup, [running AI offline on iPhone](/blog/how-to-run-ai-offline-on-iphone/) walks through it. ## Set it up before you board The one thing that ruins this is starting the download too late, because model files run from under a gigabyte to a few gigabytes and airport wifi is not the place to find out how slow that is. 1. Download a model at home or on hotel wifi, not at the gate. 2. Check the size against your phone. Most phones do well with a 3B or 4B model, and older ones are happier at 1B to 2B. The tiers are laid out in [which local AI model your iPhone can run](/blog/which-local-ai-model-can-your-iphone-run/). 3. Send one test message in airplane mode before you travel, so you know it works rather than hoping. 4. Start the flight charged, and bring a cable if the seat has power. ## What to use it for at 35,000 feet The useful framing is that the model works on whatever you give it, rather than going out to find things. That covers a lot of a flight. Drafting is the obvious one. Write the emails, messages, and replies you have been putting off, then send them all when you land. A model is good at turning a rough three lines into something you would send. Editing works well too. Paste in a document you saved before boarding and ask for a tighter version, a summary, or a plain rewrite of the parts that read badly. Same for a long article you meant to get through. Thinking out loud is underrated here. Outline a plan, pull apart a decision, prepare for the meeting waiting at the other end, or work through the argument in a piece you are writing. The uninterrupted hours are the point. Then the travel things: rehearse phrases in the language you are flying into, plan an itinerary from what you already know about the city, or get a concept explained properly because you finally have time to read the answer. ## Inflight wifi is a weak substitute Paid inflight wifi can carry a chatbot, but it is a weak foundation. The connection is shared across the whole cabin, so it slows down exactly when everyone wants it. It drops during taxi, climb, and descent, and over some regions it does not work at all. Prices vary by airline and route, and per-flight passes get expensive if you fly often. A local model sidesteps all of it. There is nothing to buy, nothing to log into, and no difference in behavior between cruising altitude and your kitchen. ## What a local model will not do on a flight It cannot fetch anything, so live information is out. No flight status, no weather at your destination, no web search, no reading your inbox, no looking up something that happened this morning. If a task needs current data, it has to wait for landing. Smaller models are also weaker on hard multi-step reasoning than the big cloud systems. For rewriting, summarizing, drafting, and explaining, a good 3B or 4B model handles the work. For hard problems the data center still wins, so save those for later. Battery is the other constraint. Running a model locally uses your CPU and GPU, so it draws more than reading a book does. Charge before you fly, and choose a smaller model on a long flight without seat power. ## The short version Download a model before you fly, test it once in airplane mode, and you have a working assistant for the whole flight without paying for wifi or trusting it with your work. Everything you type stays on the phone, which happens to be the same reason it works at all. If local AI is new to you, [what a local LLM is](/blog/what-is-a-local-llm/) covers the idea, and [prompting small models](/blog/how-to-prompt-small-models/) helps you get better answers once a smaller model is doing the work. If you are still choosing an app, we compared [the offline AI apps worth installing in 2026](/blog/best-offline-ai-apps-2026/).