LACROSSE, Wis. The Nevada-based discount airline Allegiant plans to begin flying into LaCrosse in March with non-stop ser service to Phoenix. In May there also will begin flights to Sanford, Florida, nearOrlando. Tickets currently are pegged to star at $69 one way. Allegiant didn’t announce the frequency of flights but uses a flex model  based on advance bookings. Allegiant flies Aribus 19s and 320s that seat 156 to 186 passengers depending on configuration. The airline also is expanding ts fleet with Boeing 737-Max planes with 190 seats. The only current LaCrosse flights are American Eagle’s three daily departures to Chicago and back.