Class Delta
Terms of Use
Last updated 2026-11-02.
Class Delta (the "app") is built by aviation enthusiasts ("we", "us"). By installing or using the app you agree to these terms and to the privacy policy at classdelta.app/privacy. If you do not agree, do not use the app.
1. What the app is, and is not
1.1 The app records audio from your aircraft's radio and intercom, or from a handheld radio, alerts you when it believes air traffic control has addressed your callsign, replays recent calls, and stores recordings for later review and, if you choose, in our cloud.
1.2 The app is an aid to your own listening, not a replacement for it. It is not a certified avionics device, not a flight instrument, and not approved, endorsed or reviewed by the FAA or any aviation authority. Nothing it shows, plays or says is an air traffic control instruction or clearance.
1.3 The alert can fail. Speech recognition on a radio frequency is imperfect. The app may miss a call addressed to you, alert you on a call meant for someone else, misread a callsign, split or trim a transmission wrongly, or stop working without warning because of the cable, the device, the operating system, an interruption such as a phone call, low battery, heat, or a defect in the app. You must monitor the frequency as if the app were not there.
1.4 You remain pilot in command. Under 14 CFR 91.3 and equivalent rules, the pilot in command is directly responsible for, and is the final authority as to, the operation of the aircraft. You agree not to rely on the app for any decision about flight safety, and that using it does not relieve you of any duty to hear, read back or comply with ATC.
2. Recording other people
2.1 The recording includes everything on the intercom, not only the radio. Federal law permits recording aeronautical radio, but recording the people aboard your aircraft may require their consent. Washington (RCW 9.73.030), California, Florida, Illinois and other states require the consent of everyone recorded, and a flight may cross into any of them.
2.2 Before each recording the app asks you to confirm that you are alone or that everyone aboard has agreed to the recording and to its use as described in these terms and the privacy policy. You are solely responsible for the truth of that confirmation and for obtaining any consent the law requires. Saying "the intercom is being recorded" aloud so it lands on the recording is the simplest way to do so.
2.3 You agree to indemnify and hold us harmless from any claim, loss or expense (including reasonable attorneys' fees) arising from a recording you made or uploaded without the consent the law requires, or from any other breach of these terms.
2.4 Anyone who believes they were recorded without consent may ask us to delete the recording by contacting hello@classdelta.app; we will delete it from our systems and may suspend the uploading account.
3. Your recordings and our use of them
3.1 Recordings stay on your device unless you sign in and turn on "Upload to cloud", which requires your agreement to a consent screen in the app. The privacy policy describes what is uploaded, how long it is kept and how to delete it.
3.2 You own your recordings. By uploading, you grant us a worldwide, non-exclusive, royalty-free license to store, process, transcribe, analyze, label and use them, together with the GPS track and the app's own analysis of them, to provide the service to you (backup, restore across your devices, the post-flight debrief) and to train, evaluate and improve our software and models, including by having people listen to and label them. We do not sell your recordings and do not share them with third parties except service providers acting on our behalf (currently Cloudflare for hosting and storage and Clerk for sign-in) and as the law requires.
3.3 Deleting a flight or your account removes the recording, and the labels and derived data made from it, from storage and from our dataset. A model already trained on it is not retrained; the license survives to that extent.
3.4 You are responsible for your own copies. Local storage is yours to manage; the cloud copy is a convenience, not a guaranteed archive, and we may limit storage per account or change what the free service includes, with notice in the app.
4. Recordings as evidence
A recording of your own radio work can be used against you in an FAA enforcement action, an insurance dispute or a lawsuit, and may be subject to subpoena. How long you keep recordings is your decision. If you believe you were involved in an incident or deviation, consider filing a report with the NASA Aviation Safety Reporting System (ASRS), which has its own immunity provisions; we cannot advise you on that.
5. Accounts
5.1 You must be at least 18, or a student pilot of at least 17 whose account is held by an adult who accepts these terms. One account per person; keep your sign-in credentials secure; you are responsible for activity under your account.
5.2 You may delete your account in the app at any time. We may suspend or terminate an account that breaches these terms, abuses the service or is used for unlawful recording, and we may discontinue the cloud service or the app with 30 days' notice in the app, during which you can download or share your recordings from the device.
6. Disclaimer of warranties
THE APP AND THE SERVICE ARE PROVIDED "AS IS" AND "AS AVAILABLE", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, NON-INFRINGEMENT OR UNINTERRUPTED OR ERROR-FREE OPERATION. WE DO NOT WARRANT THAT THE APP WILL DETECT ANY PARTICULAR CALL, THAT ANY RECORDING WILL BE COMPLETE OR PRESERVED, OR THAT IT IS SUITABLE FOR ANY SAFETY-RELATED PURPOSE. THIS IS A PRE-RELEASE (BETA) PRODUCT AND MAY CONTAIN DEFECTS.
7. Limitation of liability
TO THE FULLEST EXTENT PERMITTED BY LAW, WE AND OUR OFFICERS, CONTRACTORS AND SUPPLIERS ARE NOT LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY OR PUNITIVE DAMAGES, OR FOR ANY LOSS OF DATA, LOSS OF RECORDINGS, CERTIFICATE ACTION, FINES, OR PERSONAL INJURY, DEATH OR PROPERTY DAMAGE ARISING FROM THE OPERATION OF AN AIRCRAFT, ARISING OUT OF OR RELATED TO THE APP OR THESE TERMS, EVEN IF ADVISED OF THE POSSIBILITY. OUR TOTAL LIABILITY FOR ALL CLAIMS SHALL NOT EXCEED THE GREATER OF THE AMOUNT YOU PAID US IN THE TWELVE MONTHS BEFORE THE CLAIM OR USD 50. SOME JURISDICTIONS DO NOT ALLOW CERTAIN EXCLUSIONS, IN WHICH CASE THEY APPLY TO THE EXTENT PERMITTED.
8. Acceptable use
Do not use the app to intercept communications you are not entitled to hear, to record people unlawfully, to harass or identify other pilots, to reverse engineer the models, to overload the service, or in any aircraft operation where its use is prohibited by the operator or by regulation. The app and its models are licensed to you for your own flying, not sold; all rights not granted here are reserved.
9. Changes
We may change these terms. The app will show the new version and ask you to accept it before the next recording; continued use after acceptance is agreement. The version and time of each acceptance are recorded.
10. Governing law
These terms are governed by the laws of the State of Washington, without regard to conflict-of-law rules.