What Milo remembers about you

Last updated November 11, 2026

If you don't sign in

Milo does not know who you are. He counts visits, time spent and the kinds of things people ask, such as which flight or airport, tied to a random number. One number changes each visit, and one stays in your browser so a returning visitor is counted once. Neither is linked to your name. He also notes which website sent you, whether you are on a phone, tablet or computer, and your country. He does not save what you type in a free-form question. If you ask for live traffic, your starting point is sent to Google Maps for that one check and is not saved.

If you sign in

Milo keeps notes so he can help you faster and warn you before things go wrong. He stores:

• Your email address and first name, from Google or Apple sign-in. If you choose Apple's "Hide My Email", Milo only gets the relay address Apple makes for you.
• Your home airport, if you set one.
• The flights you ask him to watch, until shortly after they finish.
• A short list of flights you looked up recently.
• Notes on things you tell him about how you travel, such as airlines you fly, seat preferences and upcoming trips.
• Whether you want alerts by notification, by email or both, and which devices to notify.
• Whether you want updates from Milo. With an account, Milo may email you a welcome note and the occasional update about what is new. Every one has a link that stops them with one tap, and there is a switch in your account. Alerts for flights you save are separate.
• The same visit counts as above, linked to your account.

Milo does not store passwords, passport or ID numbers, payment details, medical details, your starting address or your live location.

Who else sees it

Milo is an AI helper. To answer you, your messages and his notes on you are sent to the AI company that runs his model, which is OpenAI or Anthropic. If you give him a screenshot of a booking, the picture is shrunk on your device, sent to that same company to be read once, and not kept by Milo. If you text Milo, your messages reach him through Photon, the company that runs his text line, and his replies go back the same way. He keeps the last few messages of a text conversation for one day so a follow-up makes sense, filed under a scrambled code made from your number. If you ask him to watch a flight by text, or link your phone to your account for alerts, he keeps your number for that purpose so he can text you first when a flight changes. He does not use it for anything else or pass it on. Text STOP and he clears the conversation, stops watching by text and removes your number. When a question needs news or an airline policy, that AI company may search the web with words from your question. If you paste an airline confirmation, its text is sent there once so Milo can find your flights. He keeps the flight numbers and dates in your conversation and does not store the rest. Flight lookups go to FlightAware, traffic checks go to Google Maps, and email alerts are sent through an email service. Notifications wake your phone without any flight details in them. Contrail does not sell your information.

Seeing and erasing it

Open your account in Milo to see everything he has noted. You can erase a single note, erase all notes, stop watching a flight or delete your account. Deleting your account erases everything listed above right away.

Questions

Milo is made by Contrail. Reach us through thecontrail.org.