Airline Jetstar has quickly offered an apology and promised an investigation after a Queensland man who visited Perth for the weekend discovered the message ‘I Am Gay’ on his suitcase when he returned home.

The message was created with baggage claim stickers and the man believes the message was added to his bag in Perth airport.

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The married stay at home dad, tweets as Sleepysarus Rex @aaronpp and writes a blog about life at One Sleepy Dad.

Jetstar have promised to investigate the incident.