fly-by-night(2)

[fly-by-night(2)] {n.}, {informal} 1. A company that sells manycheap things for a big profit and then disappears.

A dependablecompany honors its guarantees, but a fly-by-night only wants yourmoney.

2. A person who does not pay his bills, but sneaks away (as atnight.)

Hotels are bothered by fly-by-nights.