Answer: unionjack

AnswerCrossword Clue
UNIONJACKBritish flag
UNIONJACKIt flies over London
UNIONJACKApt username for John, the labor organizer?
UNIONJACKFeature of Hawaii's flag
UNIONJACKUnited Kingdom flag
UNIONJACKUnited Kingdom symbol
UNIONJACKHistoric flag.
UNIONJACKBritish national flag
UNIONJACKBritish flier
UNIONJACKBritish standard
UNIONJACKNational flag that appears on four other countries' flags
UNIONJACKIt flies all over London