Free Wi-Fi? Free checked bag? Free snacks? On Spirit?

The Florida-based carrier that is practically synonymous with budget air travel in the U.S. said Tuesday that it plans to offer packages for its highest-priced tickets, wrapping in perks it used to charge for a la carte. It’s a bid to increase revenue as it struggles with the aftermath of a U.S.-blocked takeover by JetBlue, engine recalls, an oversupplied domestic market, and larger rivals who have capitalized on premium and…