fly blind

blind date

A date (romantic meeting) between two people who have never met before.

blind leading the blind

A situation in which an unqualified person is attempting to guide, advise, or train others.

blind with science

To overwhelm someone with details in order to influence or mislead them.

fly by

To pass or go past quickly, often without much interaction

fly by the seat of one's pants

To pilot an aircraft without the aid of instruments and without a flight plan, using only instinct, visual observation, and practical judgment.

fly in the face of

To act in a manner highly contrary to; to counteract or contradict.

fly in the ointment

Something (especially a minor thing) which ruins or spoils everything else, or makes it less pleasant; a nuisance or problem; a disagreeable or unpleasant detail.

fly low

To have one's fly (zipper) undone.