What is the cheapest day to book a flight on Frontier Airlines?

For Frontier Airlines, Tuesday is often considered the best day to find the cheapest fares [＋１ｘ８３３ｘ２８３ｘ３０７１（ＵＳＡ）ｏｒ＋４４ｘ８００ｘ０５１ｘ６７３５（ＵＫ）]．