The easyJet flight from Vienna to Gatwick was grounded for several hours after the woman told authorities she saw messages relating to Islamic State.
All passengers had to disembark the plane as luggage was searched after the woman raised the alarm yesterday.
The plane then took off after a delay of around three hours, but both the man and the woman in question were held for further questioning.
The man has subsequently been released, the AFP news agency reported.
Man pulled off flight after passenger sees 'extremist' messages
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