Effective Date: April 10, 2026 · Last Updated: September 13, 2026
Preflight AI LLC (“Company,” “we,” “us”) operates TachMinder. This Privacy Policy describes how we collect, use, and protect your personal information when you use our Service. It applies to the TachMinder website, the TachMinder web application, and the TachMinder iOS app.
The usage analytics described above apply to the website and web application. The TachMinder iOS app does not include third-party analytics.
We do not sell your personal information. We share data only with:
When you use AI features (Ask TachMinder, document parsing, pre-visit summaries, advisor queries), your aircraft data and queries are sent to Anthropic's AI API for processing. Anthropic does not use your data to train their models. AI-generated responses are not retained by Anthropic beyond short-term operational use (e.g., safety monitoring) per their commercial terms.
Document extraction. Text-based PDFs are extracted on our own servers without sending the file to any third party. Scanned documents and images (e.g., photos of logbook pages, handwritten entries) are sent to Anthropic's AI vision API for optical character recognition because they cannot be read by on-server text extractors. In both cases, the extracted text and a structured representation of its contents are stored in our database alongside the original file.
Validation and review. Every extraction is checked against physical invariants (for example, hobbs time can never decrease, tach time cannot exceed hobbs time, AD numbers must match a recognized format) and classified by confidence. High-confidence extractions update your aircraft's records automatically; medium-confidence extractions are placed in a pending-review queue for your approval; low-confidence extractions are quarantined and cannot update your records until you correct them or dismiss them. The original extracted data is never overwritten — corrections are stored separately so the audit trail is preserved.
Aircraft profile as AI context. To make advisory responses accurate, we generate and maintain a per-aircraft profile that aggregates your aircraft's current times, maintenance schedule, AD compliance, oil trends, document history, and open items. When you ask the AI a question about your aircraft, this profile is included in the prompt so the model can reason about your specific situation. The profile is regenerated as your data changes and is stored with your aircraft record. Deleting the aircraft deletes the profile.
AI assistant connections. You can create an API key in your account settings (on the web or in the iOS app) to connect an AI assistant of your choosing — such as Claude or ChatGPT — to your TachMinder account. An assistant connected this way can read your aircraft data, and, if you create a read-write key, make changes to it, on your instruction. Data the assistant accesses is processed by that assistant's provider under its own terms and privacy policy, not ours. We store only a hashed form of each API key (the full key is shown to you once, at creation), and you can revoke a key at any time from the same settings.
Your data is stored on servers in the United States. We use industry-standard security measures including encrypted connections (TLS), encrypted database storage, and access controls. Uploaded files are stored in Cloudflare R2 with access restricted to your account.
Data on your device (iOS app). The TachMinder iOS app stores your sign-in tokens in the device's Keychain (Apple's encrypted credential storage); they are removed when you sign out. The app uses the camera and photo library only when you choose to photograph or attach a maintenance document, and only the photos you select are uploaded to your account's storage. The app does not access your camera, photos, or location in the background.
We retain your data for as long as your account is active.
Deleting your account and data. You can permanently delete your TachMinder account at any time from Settings → Account → Delete Account (on the web and, once available, from within the TachMinder iOS app). Before deletion, TachMinder offers a complete export of your records — your aircraft, maintenance logbook entries, maintenance items, Airworthiness Directive compliance records, flight logs, and download links for your uploaded photos and documents. Under FAA regulations (14 CFR §91.417), aircraft owners are responsible for keeping their maintenance records; TachMinder holds copies for you, and deleting your account permanently destroys those copies, so we encourage you to export them first.
When you delete your account, we immediately and permanently delete: your profile; every aircraft you own together with its maintenance records, logbook entries, AD compliance records, flight logs, and oil analysis data; your uploaded photos and documents; your notification and device registrations; and your saved API keys. Any active subscription is canceled immediately. If you shared aircraft with co-owners, their access ends when your aircraft records are deleted. If you are a maintenance provider, your provider profile and submissions are deleted, but logbook entries you recorded for aircraft owners remain part of those owners' maintenance records. Deletion is not reversible, and Preflight AI LLC cannot recover your records afterward.
Some information survives account deletion: records other users are entitled to keep (such as an owner's logbook entries documenting work you performed), and billing records retained by our payment processor (Stripe) as required for financial and tax purposes. Your login identity at our authentication provider (Auth0) is deleted as part of account deletion.
Uploaded documents, their extracted text, structured parse results, and the per-aircraft profile described in Section 4 are retained for the life of the associated aircraft record. Deleting an individual document removes that document's file, extracted text, and structured parse results. Deleting an aircraft removes the aircraft's profile and all associated documents and extracted content.
You have the right to:
To exercise these rights, contact us at support@tachminder.com.
Washington State residents may have additional rights under the Washington My Health My Data Act and other applicable state law. Please contact us at support@tachminder.com to exercise any state-specific rights.
California residents may have rights under the California Consumer Privacy Act (CCPA), including the right to know what personal information we collect and the right to request deletion. You can delete your account and data or export your records yourself at any time using the tools described in Sections 6 and 7, or submit a CCPA request by contacting us at support@tachminder.com.
We use cookies for authentication (session management) and analytics (Google Analytics 4, Microsoft Clarity). You can manage cookie preferences through your browser settings or our cookie consent banner.
TachMinder is not intended for children under 18. We do not knowingly collect personal information from minors.
TachMinder is operated from the United States. If you access the Service from outside the US, your information will be transferred to and processed in the United States.
We may update this Privacy Policy from time to time. Material changes will be communicated via email or in-app notification. The “Last Updated” date at the top reflects the most recent revision.
Privacy questions or data requests? Contact us at support@tachminder.com.
Preflight AI LLC
Washington State, USA