@squawk/flightplan

Pure logic library for parsing flight plan route strings into structured, coordinate-resolved route elements. Composes airport, navaid, fix, airway, and procedure resolvers to classify and resolve each token in a route string. Contains no bundled data - accepts resolver instances at initialization. For zero-config use, pair with the companion data and resolver packages.

Part of the @squawk aviation library suite. See all packages on npm.

Usage

import { createFlightplanResolver } from '@squawk/flightplan';
import { createAirportResolver } from '@squawk/airports';
import { createNavaidResolver } from '@squawk/navaids';
import { createFixResolver } from '@squawk/fixes';
import { createAirwayResolver } from '@squawk/airways';
import { createProcedureResolver } from '@squawk/procedures';
import { usBundledAirports } from '@squawk/airport-data';
import { usBundledNavaids } from '@squawk/navaid-data';
import { usBundledFixes } from '@squawk/fix-data';
import { usBundledAirways } from '@squawk/airway-data';
import { usBundledProcedures } from '@squawk/procedure-data';

const resolver = createFlightplanResolver({
  airports: createAirportResolver({ data: usBundledAirports.records }),
  navaids: createNavaidResolver({ data: usBundledNavaids.records }),
  fixes: createFixResolver({ data: usBundledFixes.records }),
  airways: createAirwayResolver({ data: usBundledAirways.records }),
  procedures: createProcedureResolver({ data: usBundledProcedures.records }),
});

const route = resolver.parse('KJFK DCT MERIT J60 MARTN DCT KLAX');
for (const element of route.elements) {
  console.log(element.type, element.raw);
}
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All resolver providers are optional. Tokens that require a missing provider are marked as unresolved:

import { createFlightplanResolver } from '@squawk/flightplan';

// Works with only the resolvers you have
const resolver = createFlightplanResolver({ airports: myAirportResolver });
const route = resolver.parse('KJFK DCT KLAX');
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Browser / SPA usage

The resolver factory has no Node-specific imports and ships an explicit /browser subpath for SPAs and edge runtimes. Pair it with the /browser entries of the resolvers you want to compose:

import { loadUsBundledAirports } from '@squawk/airport-data/browser';
import { loadUsBundledNavaids } from '@squawk/navaid-data/browser';
import { loadUsBundledFixes } from '@squawk/fix-data/browser';
import { loadUsBundledAirways } from '@squawk/airway-data/browser';
import { loadUsBundledProcedures } from '@squawk/procedure-data/browser';
import { createAirportResolver } from '@squawk/airports/browser';
import { createNavaidResolver } from '@squawk/navaids/browser';
import { createFixResolver } from '@squawk/fixes/browser';
import { createAirwayResolver } from '@squawk/airways/browser';
import { createProcedureResolver } from '@squawk/procedures/browser';
import { createFlightplanResolver } from '@squawk/flightplan/browser';

const [airports, navaids, fixes, airways, procedures] = await Promise.all([
  loadUsBundledAirports(),
  loadUsBundledNavaids(),
  loadUsBundledFixes(),
  loadUsBundledAirways(),
  loadUsBundledProcedures(),
]);

const resolver = createFlightplanResolver({
  airports: createAirportResolver({ data: airports.records }),
  navaids: createNavaidResolver({ data: navaids.records }),
  fixes: createFixResolver({ data: fixes.records }),
  airways: createAirwayResolver({ data: airways.records }),
  procedures: createProcedureResolver({ data: procedures.records }),
});
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The /browser entry is identical to the main entry; the separate subpath exists so browser support is an explicit, publint-verified part of the public API surface.

API

createFlightplanResolver(options)

Creates a resolver from optional lookup providers.

Parameters:

• options.airports - airport lookup (must provide byFaaId and byIcao)
• options.navaids - navaid lookup (must provide byIdent)
• options.fixes - fix lookup (must provide byIdent)
• options.airways - airway lookup (must provide byDesignation and expand)
• options.procedures - procedure lookup (must provide byIdentifier and expand)

Returns: FlightplanResolver - an object with the parse method described below.

resolver.parse(routeString)

Parses a flight plan route string into an ordered sequence of resolved elements. Each whitespace-separated token is classified and resolved against the configured lookup providers.

Returns: ParsedRoute with:

• raw - the original route string
• elements - ordered array of RouteElement values

Route element types

Each element has a type discriminant and a raw field with the original token.

Coordinate formats

• DDMMN/DDDMMEW (e.g. 4030N07045W for 40 deg 30 min N, 70 deg 45 min W)
• DDN/DDDEW (e.g. 40N070W for 40 deg N, 70 deg W)

Speed/altitude formats

• N0450F350 - 450 knots at FL350
• K0830F350 - 830 km/h at FL350
• M082F350 - Mach 0.82 at FL350
• N0250A065 - 250 knots at 6500 ft

Airway handling

When a token matches an airway designation and both a previous waypoint and a next token (exit fix) are available, the resolver expands the airway between those fixes. The exit fix token is consumed as part of the airway element. If expansion fails, the airway token falls through to other resolution strategies.

Identifier ambiguity

When a token could match multiple entity types (e.g. a 3-letter code matching both an airport and a navaid), the resolver uses this priority order:

1. Airway (if previous waypoint context exists and next token available)
2. Airport (ICAO or FAA ID)
3. Procedure (SID/STAR)
4. Fix
5. Navaid