A Black Friday airfare dogfight appears to have broken out between rival discount carriers Spirit and Frontier airlines, as both announced Friday they are briefly selling one-way tickets for $30 or less under for cold weather travel.

Spirit and Frontier, a multi-time Spirit acquisition suitor , also said members of their loyalty programs can get lower prices than the ones advertised for non-members.

The offers are a continued test of the airlines’ low-price business models which are designed to attract leisure travelers.

Here are details of the deals:

Spirit

Dania Beach, Florida-based Spirit calls its program “Black & Yellow Friday,” after the black lettering and yellow paint jobs on its jetliners. The deals, the carrier said, are designed to give travelers savings during the holi

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