How ManyToFly works
There is no sign-up
The first time the app runs it signs in anonymously and is issued a random identifier — a string of digits and letters generated for that installation. It is not linked to your name, email address, Apple ID or Google account, and we cannot work out who you are from it. It is the only identifier in the app.
What a search sends
When you run a search, the app sends us the home cities you entered (as airport and city codes such as MAD or BER), the date range you chose, your trip-length preference, any filters you set — a maximum price per person, or a region — and the currency you are viewing in. We send back the ranked destinations.
What we keep afterwards, and why
That search is stored on our servers against your random identifier: the cities, the dates, the filters, the currency and the results we returned. It is stored because a search engine over cached fares only works if it knows what people are actually asking for. Concretely, it tells us which departure cities to keep priced, which combinations return nothing useful, and which cities to add next. Where a city you asked for had no cached prices, that miss is recorded too.
What the city picker sends
When you type into the city picker we record what you typed, up to 120 characters, together with how many matches it produced and which city you finally chose. This includes text you typed and then abandoned without choosing anything. It exists for one reason: to find the gaps in our city index, where somebody types Cologne and our list only answers to Köln. Please don't type anything into it that you would not want recorded — it is a city search box, and that is all it is for.
What you tell us on purpose
Every so often, after a set of results, the app asks whether we found you somewhere good. Answering is entirely optional and the question can be dismissed. If you answer no, you are offered a box to say what was wrong; what you write there is sent to us, along with the language and platform you are using, and stored against the search that prompted it so we can reproduce the problem. Write only what you want us to read, and please leave out anything that identifies you or anybody else. If you answer yes, nothing is sent but the thumbs-up, and your phone's own app store handles any rating you choose to leave — we never see it as coming from you.
What your taps send
We record which destinations a results list showed you and in what order, which one you opened and where it sat in the list, and the same again if you share one. That is how we know whether the ranking is any good — a list nobody taps is a list in the wrong order. No page-by-page trail of your movements through the app is kept.