An example of how to setup an Adobe AIR for Android application xml file to enable incoming NFC data.

SampleManifestAdditions.xml

<manifestAdditions>
  <![CDATA[
  <manifest android:installLocation="auto">
    <!-- I left out the "default" AIR manifest additions that are there by default. You should keep those. -->
    
    <uses-permission android:name="android.permission.NFC" />
    <uses-feature android:name="android.hardware.nfc" android:required="true" />
    
    <application android:enabled="true">
      <activity android:excludeFromRecents="false">
        <intent-filter>
          <action android:name="android.intent.action.MAIN"/>
          <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
        
        <intent-filter>
          <action android:name="android.nfc.action.NDEF_DISCOVERED" />
          <category android:name="android.intent.category.DEFAULT" />
          <data android:scheme="{SCHEME}" android:host="{HOST}" />
        </intent-filter>
      </activity>
    </application>
  </manifest>
  ]]>
</manifestAdditions>

Read the blog post explaining how to use this:
http://creativedrewy.blogspot.com/2013/01/receive-nfc-data-in-adobe-air-android.html