A feature on many modern-day smartphones that disconnects from all networks. Originally intended for when boarding an aircraft but can also be used when you want to temporarily avoid someone by not letting him/her reach you via phone/text based means.
"Man! Sam's been bitching at me about last night. I just sent her a text telling her to f*ck off and went into flight mode.. I'll deal with her later when this hangover goes away!"
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