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apilayer aviationstack vs Transport for United States

Same instrument, two spec sheets — measured, not claimed.

APIapilayer aviationstackHEALTHY92Transport for United StatesHEALTHY84
Uptime · 30d
Uptime · 90d98.0%100%
Uptime · 30d96.7%100%
P50 · ms5351093
P95 · ms11471963
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedData copyright transit agencies / Umo IQ
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

apilayer aviationstack vs Transport for United States: common questions

Which is more reliable, apilayer aviationstack or Transport for United States?

On our scheduled checks, Transport for United States leads on measured uptime — apilayer aviationstack at 98.0% versus Transport for United States at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, apilayer aviationstack or Transport for United States?

apilayer aviationstack has the lower median latency in our checks — apilayer aviationstack responds in 535 ms versus Transport for United States at 1093 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do apilayer aviationstack and Transport for United States need an API key?

Transport for United States needs no key, while apilayer aviationstack requires a free API key. If you want to start calling without signup, reach for Transport for United States first.

Can I call apilayer aviationstack and Transport for United States from the browser?

Only Transport for United States is browser-friendly — it returns CORS headers over HTTPS. apilayer aviationstack needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are apilayer aviationstack and Transport for United States free for commercial use?

apilayer aviationstack has unclear commercial terms, and Transport for United States has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.