She should take the train

From the BBC:

A superstitious elderly passenger delayed a flight in Shanghai after throwing coins at the engine for good luck, a Chinese airline has confirmed.

The 80-year-old woman threw her change at the China Southern Airlines flight as she crossed the tarmac to board.

She told police she launched the coins as she "prayed for safety" on Tuesday.

Of the nine coins launched, only one hit its intended target - but this was enough to force the evacuation of 150 passengers for several hours.

Police were called to Shanghai Pudong International Airport after a passenger noticed the woman's bizarre behaviour, apparently aimed at ensuring a safe flight, and alerted authorities.