Without the planes, Southwest says it will cancel about 175 flights each weekday.
Officials for Indianapolis-based Republic said the registered program will be the only one of its kind in Indiana and one of only eight in the United States.
With the addition of the new year-round routes, Allegiant will offer service from Indianapolis to 15 cities in the South and Southwest.
The plane is expected to start flying again in January 2020 “under the latest scenario,” the Wall Street Journal reported, citing unidentified sources within the Federal Aviation Administration and pilot-union leaders.
TSA expects to screen about 12.1 million people between Wednesday and Sunday for the July 4 holiday period.
A person familiar with the matter said the latest setback is likely to delay the plane’s return to service by an extra one to three months.
Aviation officials from more 30 countries met with the FAA to hear the U.S. regulator's approach to reviewing changes that Boeing is making after two crashes that killed 346 people.
With Boeing 737 Max jets grounded after two deadly accidents, U.S. airlines will operate about 200 fewer daily flights than planned through the heart of the peak summer season. That’s around 35,000 seats lost every day.
The Indianapolis International Airport is using a California firm’s motion-analytics platform in an effort to provide travelers with real-time updates on security checkpoint wait times and to monitor foot traffic in other parts of the airport.
Major U.S. airlines experienced some delays Monday following a technical glitch at a third-party vendor. The issue has been resolved, but caused some disruption in travel plans.
The low-cost carrier is a newcomer to Indianapolis, launching service to Las Vegas and Orlando this week. Spirit plans to begin service to two more destinations this fall.
Growth in international airline traffic, fuller planes and the addition of 500 flights by Allegiant Air helped led to record passenger traffic at Indianapolis International Airport in 2018.
The Indianapolis-based airline said the problem has now been fixed, though some of its flights will be affected Friday as it works through its schedule.
Fast-growing national low-cost carrier Spirit Airlines plans to begin operations in Indianapolis next year, beginning with nonstop flights to and from three destinations.
Flights from Indianapolis International Airport to Chicago were experiencing delays of almost 2-1/2 hours Monday morning.
The authority said it's the biggest total of grants that it's received, topping $18 million in 2017.
The agreement, which still must be ratified by Teamsters Local 135 members, covers about 2,100 Republic flight attendants.
Lawmakers abandoned a plan backed by airlines to privatize the nation's air-traffic-control system.
Thirteen U.S. carriers collected $4.6 billion in bag fees alone last year, according to U.S. Transportation Department statistics.