"proof planes" meaning in All languages combined

{
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    {
      "args": {
        "1": "en",
        "2": "noun form"
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      "expansion": "proof planes",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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      ],
      "form_of": [
        {
          "word": "proof plane"
        }
      ],
      "glosses": [
        "plural of proof plane"
      ],
      "id": "en-proof_planes-en-noun-hHQ5WMjZ",
      "links": [
        [
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          "proof plane#English"
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      "tags": [
        "form-of",
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  ],
  "word": "proof planes"
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{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "noun form"
      },
      "expansion": "proof planes",
      "name": "head"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "form_of": [
        {
          "word": "proof plane"
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      "glosses": [
        "plural of proof plane"
      ],
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        ]
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  "word": "proof planes"
}