JetBlue founder says struggling airlines need to ditch barebones planes and give flyers more choices

• Budget airlines like Spirit, Frontier, and Southwest are struggling to turn a profit.

• Low-cost veteran David Neeleman told BI that Spirit and Frontier should merge to survive.

• He said Southwest and others should lean into changing times and give customers more choice.

Budget airlines are starting to look very different from their traditional no-frills…