Spirit Airlines sale plus 5000 bonus miles

Spirit is offering 5000 bonus frequent flyer miles for new bookings and travel by June 13. They're also having a sale with fares ranging from $19 to $89 each way. Hardly the best deal they've offered, but the miles bonus might be an incentive, and fares are readily available albeit only for certain travel days in May. This offer is valid through midnight April 30.