diff --git a/lib/MessageDecoder.ts b/lib/MessageDecoder.ts
index b40f43a..56487f9 100644
--- a/lib/MessageDecoder.ts
+++ b/lib/MessageDecoder.ts
@@ -78,6 +78,7 @@ const pluginClasses = [
   Plugins.Label_QQ,
   Plugins.Label_QR,
   Plugins.Label_QS,
+  Plugins.Label_81_MVA,
 ];
 
 export class MessageDecoder {
diff --git a/lib/plugins/Label_81_MVA.ts b/lib/plugins/Label_81_MVA.ts
new file mode 100644
index 0000000..68c18c1
--- /dev/null
+++ b/lib/plugins/Label_81_MVA.ts
@@ -0,0 +1,224 @@
+import { DecoderPlugin } from '../DecoderPlugin';
+import { DecodeResult, Message, Options } from '../DecoderPluginInterface';
+import { ResultFormatter } from '../utils/result_formatter';
+import { DateTimeUtils } from '../DateTimeUtils';
+
+/**
+ * Label 81 — MVA (Aircraft-Initiated Movement Message)
+ *
+ * An APAC / Jetstar-originated airline free-text ACARS label carrying an
+ * IATA AHM 780 **MVA** payload — a machine-generated arrival / departure /
+ * delay movement report transmitted automatically.
+ *
+ * Wire format (arrival variant observed):
+ *
+ *   MVA
+ *   JST0122/20.VHOYR.MEL
+ *   AA0945/0950
+ *   SI FB  37
+ *
+ * Lines:
+ *   1. Message type identifier (MVA / MVT)
+ *   2. <carrier><flight>/<day>.<registration>.<airport-of-movement-IATA>
+ *   3. Movement times:
+ *        AA <touchdown-HHMM> / <on-blocks-HHMM>   (arrival)
+ *        AD <off-blocks-HHMM> / <takeoff-HHMM>    (departure — analogous)
+ *   4. Optional supplementary information:
+ *        SI <tag> <value>   e.g. `SI FB 37` = Fuel on Board 37 (units per op)
+ */
+export class Label_81_MVA extends DecoderPlugin {
+  name = 'label-81-mva';
+
+  qualifiers() {
+    return {
+      labels: ['81'],
+      preambles: ['MVA', 'MVT'],
+    };
+  }
+
+  decode(message: Message, options: Options = {}): DecodeResult {
+    const decodeResult = this.initResult(
+      message,
+      'Aircraft-Initiated Movement Message (MVA)',
+    );
+
+    const text = (message.text || '').replace(/\r/g, '').trim();
+    if (!text) {
+      this.setDecodeLevel(decodeResult, false);
+      return decodeResult;
+    }
+
+    const lines = text.split(/\n+/).map((l) => l.trim()).filter((l) => l);
+    if (lines.length < 2) {
+      this.setDecodeLevel(decodeResult, false);
+      return decodeResult;
+    }
+
+    // Line 1: message type — MVA or MVT
+    const msgType = lines[0];
+    if (!/^(MVA|MVT)$/.test(msgType)) {
+      this.setDecodeLevel(decodeResult, false);
+      return decodeResult;
+    }
+    decodeResult.raw.mva_type = msgType;
+
+    // Line 2: <carrier><flight>/<day>.<tail>.<airport>
+    const idRe =
+      /^(?<carrier>[A-Z]{2,3})(?<flight>\d{1,5}[A-Z]?)\/(?<day>\d{1,2})\.(?<tail>[A-Z0-9-]{3,10})\.(?<airport>[A-Z]{3,4})$/;
+    const idm = lines[1].match(idRe);
+    if (!idm?.groups) {
+      this.setDecodeLevel(decodeResult, false);
+      return decodeResult;
+    }
+    const { carrier, flight, day, tail, airport } = idm.groups;
+    const fullFlight = `${carrier}${flight}`;
+    decodeResult.raw.carrier = carrier;
+    decodeResult.raw.flight_number = fullFlight;
+    decodeResult.raw.day = Number(day);
+    decodeResult.raw.tail = tail;
+    decodeResult.raw.airport = airport;
+    ResultFormatter.flightNumber(decodeResult, fullFlight);
+    ResultFormatter.tail(decodeResult, tail);
+
+    // Line 3 (optional): AA <touchdown> / <on-blocks>   or AD <off-blocks> / <takeoff>
+    let aaTouchdown = '';
+    let aaOnBlocks = '';
+    let adOffBlocks = '';
+    let adTakeoff = '';
+    if (lines[2]) {
+      const aa = lines[2].match(/^AA(?<t1>\d{4})(?:\/(?<t2>\d{4}))?$/);
+      const ad = !aa
+        ? lines[2].match(/^AD(?<t1>\d{4})(?:\/(?<t2>\d{4}))?$/)
+        : null;
+      if (aa?.groups) {
+        aaTouchdown = aa.groups.t1;
+        aaOnBlocks = aa.groups.t2 || '';
+        decodeResult.raw.actual_touchdown = `${aaTouchdown.substring(0, 2)}:${aaTouchdown.substring(2, 4)}`;
+        if (aaOnBlocks) {
+          decodeResult.raw.actual_on_blocks = `${aaOnBlocks.substring(0, 2)}:${aaOnBlocks.substring(2, 4)}`;
+        }
+        ResultFormatter.arrivalAirport(decodeResult, airport);
+        ResultFormatter.timestamp(
+          decodeResult,
+          DateTimeUtils.convertHHMMSSToTod(aaTouchdown + '00'),
+        );
+      } else if (ad?.groups) {
+        adOffBlocks = ad.groups.t1;
+        adTakeoff = ad.groups.t2 || '';
+        decodeResult.raw.actual_off_blocks = `${adOffBlocks.substring(0, 2)}:${adOffBlocks.substring(2, 4)}`;
+        if (adTakeoff) {
+          decodeResult.raw.actual_takeoff = `${adTakeoff.substring(0, 2)}:${adTakeoff.substring(2, 4)}`;
+        }
+        ResultFormatter.departureAirport(decodeResult, airport);
+        ResultFormatter.timestamp(
+          decodeResult,
+          DateTimeUtils.convertHHMMSSToTod(adOffBlocks + '00'),
+        );
+      }
+    }
+
+    // Line 4 (optional): SI <tag> <value>  — e.g. "SI FB  37"
+    let siTag = '';
+    let siValue = '';
+    if (lines[3]) {
+      const si = lines[3].match(/^SI\s+([A-Z]{1,4})\s+([A-Z0-9.\-]+)\s*$/);
+      if (si) {
+        siTag = si[1];
+        siValue = si[2];
+        decodeResult.raw.supplementary_tag = siTag;
+        decodeResult.raw.supplementary_value = siValue;
+      }
+    }
+
+    // ── formatted output ──
+    decodeResult.formatted.items.unshift(
+      {
+        type: 'message_type',
+        code: 'MSGTYP',
+        label: 'Message Type',
+        value:
+          msgType === 'MVA'
+            ? 'Aircraft-Initiated Movement Message (MVA)'
+            : 'Movement Message (MVT)',
+      },
+      {
+        type: 'mva_type',
+        code: 'MVATYPE',
+        label: 'MVA/MVT Indicator',
+        value: msgType,
+      },
+    );
+
+    decodeResult.formatted.items.push(
+      {
+        type: 'carrier',
+        code: 'CARRIER',
+        label: 'Carrier Code',
+        value: carrier,
+      },
+      {
+        type: 'day',
+        code: 'DAY',
+        label: 'Day of Month',
+        value: day,
+      },
+      {
+        type: 'airport',
+        code: 'APT',
+        label: 'Airport of Movement',
+        value: airport,
+      },
+    );
+
+    if (aaTouchdown) {
+      decodeResult.formatted.items.push({
+        type: 'actual_touchdown',
+        code: 'AAT',
+        label: 'Actual Touchdown (UTC)',
+        value: `${aaTouchdown.substring(0, 2)}:${aaTouchdown.substring(2, 4)}`,
+      });
+    }
+    if (aaOnBlocks) {
+      decodeResult.formatted.items.push({
+        type: 'actual_on_blocks',
+        code: 'AAB',
+        label: 'Actual On Blocks (UTC)',
+        value: `${aaOnBlocks.substring(0, 2)}:${aaOnBlocks.substring(2, 4)}`,
+      });
+    }
+    if (adOffBlocks) {
+      decodeResult.formatted.items.push({
+        type: 'actual_off_blocks',
+        code: 'ADB',
+        label: 'Actual Off Blocks (UTC)',
+        value: `${adOffBlocks.substring(0, 2)}:${adOffBlocks.substring(2, 4)}`,
+      });
+    }
+    if (adTakeoff) {
+      decodeResult.formatted.items.push({
+        type: 'actual_takeoff',
+        code: 'ADT',
+        label: 'Actual Takeoff (UTC)',
+        value: `${adTakeoff.substring(0, 2)}:${adTakeoff.substring(2, 4)}`,
+      });
+    }
+
+    if (siTag) {
+      const siLabelMap: Record<string, string> = {
+        FB: 'Fuel on Board',
+      };
+      const siLabel = siLabelMap[siTag]
+        ? `${siTag} (${siLabelMap[siTag]})`
+        : siTag;
+      decodeResult.formatted.items.push({
+        type: 'supplementary',
+        code: 'SI',
+        label: 'Supplementary Info',
+        value: `${siLabel}: ${siValue}`,
+      });
+    }
+
+    this.setDecodeLevel(decodeResult, true, 'full');
+    return decodeResult;
+  }
+}
diff --git a/lib/plugins/official.ts b/lib/plugins/official.ts
index 0d3d6fa..ff83f11 100644
--- a/lib/plugins/official.ts
+++ b/lib/plugins/official.ts
@@ -64,3 +64,4 @@ export * from './Label_QR';
 export * from './Label_QP';
 export * from './Label_QS';
 export * from './Label_QQ';
+export * from './Label_81_MVA';