Point of no return API

Computes the point-of-no-return distance and time given usable fuel, burn and asymmetric out/back ground speeds with reserve. Answers 'How far out can I fly and still return on fuel?', 'What is my PNR time with a tailwind out and headwind back?'.

Price$0.06per request

MethodPOST

Route/v1/nav/point-of-no-return

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

aviationpnrpoint-of-no-returnfuelenduranceflight-planningsafetyreserve

API URLhttps://x402.hexl.dev/v1/nav/point-of-no-return

Integration docs

Example request

{
  "usableFuelUnits": 40,
  "burnRatePerHour": 10,
  "groundSpeedOutKt": 120,
  "groundSpeedBackKt": 160
}

Example response

{
  "distanceToPnrNm": 274.3,
  "timeToPnrHr": 2.286,
  "timeToPnrMin": 137.1,
  "usableEnduranceHr": 4,
  "interpretation": "Point of no return at 274.3 nm (137.1 min out); beyond this you cannot return with the stated reserve."
}

Input schema

{
  "type": "object",
  "required": [
    "usableFuelUnits",
    "burnRatePerHour",
    "groundSpeedOutKt",
    "groundSpeedBackKt"
  ],
  "properties": {
    "usableFuelUnits": {
      "type": "number",
      "examples": [
        40
      ]
    },
    "burnRatePerHour": {
      "type": "number",
      "examples": [
        10
      ]
    },
    "groundSpeedOutKt": {
      "type": "number",
      "examples": [
        120
      ]
    },
    "groundSpeedBackKt": {
      "type": "number",
      "examples": [
        160
      ]
    },
    "reserveMinutes": {
      "type": "number",
      "examples": [
        0
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}