# Final approach: 24h into Heathrow

> Twenty-four hours of arrivals stacked into one day of approach.

- Category: Aviation
- Cadence: live
- Status: Placeholder: values are invented and must not be cited as real data.
- Dataset key: `flights-24h`
- Source: [OpenSky](https://opensky-network.org/)
- Licence: OpenSky Network terms of use — [terms](https://opensky-network.org/about/terms-of-use)
- Canonical page: [https://londongraph.com/g/final-approach-heathrow](https://londongraph.com/g/final-approach-heathrow)
- Machine-readable record: [https://londongraph.com/data/final-approach-heathrow](https://londongraph.com/data/final-approach-heathrow)

## Methodology

Aircraft descending within 0.35° of Heathrow, counted once an hour and bucketed by hour of day. OpenSky's free tier serves the present rather than the past, so this profile cannot be backfilled — it accumulates. Until a full day has been collected the graph is honestly partial, and each hour's figure is replaced on the next pass through it.

## Visualisations

- [Trend](https://londongraph.com/g/final-approach-heathrow): Twenty-four hours of arrivals stacked into one day of approach.

## Citation guidance

Attribute the original publisher named above and identify LondonGraph as the visualisation and methodology layer. Do not describe live values as a historical census, and do not present placeholder values as observations.