Add 航空 to zh airport-word blocklist

Data fixes: BCY/QOW had airline names as name_zh ('衣索比亞航空',
'馬拉維航空'); NEL/ROW had facility names ('萊克湖海軍航空總站',
'羅斯威爾國際航空中心'). All replaced with city transliterations.

test/test_invariants.py

@@ -190,11 +190,11 @@ def test_no_typographic_quotes_in_ru(dataset):
     assert bad == [], f"name_ru with «» quotes: {bad[:10]}"
 
 
-_AIRPORT_ZH = re.compile(r'機場|机場|机场|空港')
+_AIRPORT_ZH = re.compile(r'機場|机場|机场|空港|航空')
 
 
 def test_no_airport_words_in_zh(dataset):
-    """name_zh must not contain airport-article words like 機場."""
+    """name_zh must not contain airport/aviation words like 機場 or 航空."""
     bad = [(e['code'], e['name_zh']) for e in dataset
            if e.get('name_zh') and _AIRPORT_ZH.search(e['name_zh'])]
     assert bad == [], f"name_zh with airport word: {bad[:10]}"