Existing flight data APIs (FlightAware, ADS-B Exchange) are expensive, return bloated payloads, and are priced out of reach for indie developers, hobbyists, and small startups building aviation-adjacent tools.
A real-time flight positions API with aggressive data compression, flexible filtering (by region, altitude, airline), and developer-friendly pricing. Sub-500KB responses for global coverage.
subscription — free tier (limited calls, delayed data); paid tiers ($19-199/mo) for real-time data, higher rate limits, historical queries, and webhook alerts.
The pain is real but narrow. Indie devs who hit FlightAware's paywall genuinely feel it — the jump from free to hundreds of dollars/month kills side projects. The HN engagement (86 upvotes on a flight viz demo) confirms interest. However, the total number of developers who need real-time flight positions (not just flight status) is small. Most travel apps need schedules, not ADS-B positions. The pain is intense for those who feel it, but the audience is niche.
TAM is limited. The intersection of 'needs real-time flight position data' AND 'can't afford FlightAware' AND 'OpenSky/ADS-B Exchange free tiers don't suffice' is small — likely thousands, not tens of thousands, of potential paying developers. At $19-199/mo, even capturing 1,000 paying users at average $50/mo = $600K ARR ceiling. Drone/UTM integration could expand this but that's speculative. This is a lifestyle business market, not a venture-scale one.
Mixed signals. Indie devs and hobbyists are notoriously price-sensitive — many will stick with OpenSky's free tier or scrape ADS-B Exchange. The $19/mo entry is psychologically right, but conversion from free will be tough. The developers building real products (travel startups, logistics tools) who would pay $99-199/mo are more likely to just pay for FlightAware for reliability. The middle ground ($19-99) is where you'd live, and that audience is small and cheap.
Very buildable. ADS-B data is publicly available from multiple sources (OpenSky, community receivers, your own receiver network). A solo dev can absolutely build an ingestion pipeline + compression layer + REST API in 4-8 weeks. The core insight (sub-500KB compressed payloads via aggressive filtering and binary/protobuf encoding) is a straightforward engineering optimization. The hard parts come later: maintaining uptime at scale, global coverage, and running receiver infrastructure.
There IS a gap — no one serves the 'lightweight, cheap, developer-friendly flight positions' niche well. OpenSky is closest but unreliable and rate-limited. However, the gap exists partly because the market is small. FlightAware and FR24 deliberately don't serve this tier because the revenue doesn't justify support costs. You'd own the niche, but it's a niche that incumbents choose to ignore rather than one they can't reach.
Naturally subscription. API access is inherently recurring — once a developer integrates, they pay monthly as long as their app runs. Flight data is consumed continuously, not one-time. Churn risk comes from projects dying (indie dev apps have high mortality) and from OpenSky/free alternatives being 'good enough.' But the subscription model itself is a perfect fit.
- +Clear, real pain point validated by community engagement (HN traction, flight-viz.com demo proving the compression thesis)
- +Technically very feasible for a solo dev — straightforward data pipeline with well-understood infrastructure
- +Natural subscription model with low marginal cost per user once infrastructure is built
- +No direct competitor occupies the 'cheap, lightweight, developer-friendly flight positions API' niche
- +ADS-B data is essentially free to source, so gross margins can be very high (80%+)
- !Small TAM ceiling — this may cap out as a $5-30K/mo lifestyle business, not a venture-scale company
- !OpenSky Network is free and 'good enough' for many use cases, making conversion to paid very hard
- !Data sourcing dependency — if you rely on OpenSky or community feeds, you inherit their coverage gaps and reliability issues; building your own receiver network is capital-intensive
- !Indie dev customers have high project abandonment rates, leading to elevated churn
- !FlightAware or ADS-B Exchange could launch a developer-friendly tier at any time and crush you with superior data quality
Enterprise-grade flight tracking API offering real-time positions, flight status, historical data, and predictive ETAs. The gold standard in aviation data APIs.
Community-driven ADS-B data aggregator providing unfiltered flight tracking data via API and bulk feeds. Known for not filtering military/government flights.
Academic/open-source ADS-B network providing free API access to real-time and historical flight state vectors from a global receiver network.
REST API focused on flight status, schedules, and airport data. More of a flight status API than a position-tracking API.
The consumer-facing flight tracker also offers commercial data feeds and B2B APIs for enterprise customers.
Ingest OpenSky Network's free state vector feed every 5-10 seconds. Store in a time-series DB (TimescaleDB or InfluxDB). Expose a single REST endpoint: GET /positions with query params for bounding box (lat/lng), altitude range, and airline ICAO filter. Return MessagePack or gzipped JSON, targeting <500KB for global unfiltered queries. Add API key auth via a simple dashboard. Ship free tier (100 requests/day, 10-second delay) and one paid tier ($19/mo, real-time, 1000 requests/day). Deploy on a single $20/mo VPS. Total MVP cost: ~$50/mo infrastructure, 4-6 weeks build time.
Free tier (100 req/day, delayed) to build developer community and SEO → $19/mo Starter (real-time, 1K req/day) → $49/mo Pro (historical queries, 10K req/day, webhook alerts) → $199/mo Business (SLA, priority support, bulk endpoints) → Enterprise custom pricing for companies that outgrow self-serve. Affiliate play: monetize the free tier further by being the recommended data source in aviation dev tutorials and open-source projects.
4-6 weeks to MVP, 2-3 months to first paying customer. The bottleneck isn't building — it's distribution. You need to be visible where aviation devs hang out: HN Show posts, Reddit r/aviation and r/adsb, dev.to tutorials, GitHub starter projects using your API. Expect 6-12 months to reach $1K MRR given the niche audience.
- “I'm surprised all the flights in the world can be represented in a <500KB api call (implies existing APIs are inefficient and over-deliver data)”
- “Why is there almost no traffic in places like South America and Africa? Data set or reality? (coverage gaps in affordable data sources)”