Some of the groups have been around for decades, others are fly-by-night.
And not fly-by-night issues either, but stalwarts such as G.E., Citi, Google.
Does any one figger I'll allow some fly-by-night charl'tan to go reeflectin' on me?
He'll be out with a fly-by-night troupe afore the next month.
Throughout the country local managers began to steal the Madison Square plays and put them on with "fly-by-night" companies.
Shown up in our newspapers as a ditch-digger—a fly-by-night—a nobody!
She certainly has acted like a fly-by-night up to this time.
Had the wind been directly astern, the course of the fly-by-night would have been smoother.
You love me, an actress in a fly-by-night company, a variety artist at the Gayety!
She now knew where she was, but was nearly dying from the exhaustion of his fly-by-night expeditions.
1796, slang, said to be an old term of reproach to a woman signifying that she was a witch; extended 1823 to "anyone who departs hastily from a recent activity," especially while owing money. The two senses involve the two verbs fly.
Shady or untrustworthy: “Before buying stock in a newly formed company, the prudent investor will check its owners' credentials to make sure it's not a fly-by-night operation.”
Undependable and dishonest: fly-bynight correspondence school