New nonstop flights between Indianapolis and San Francisco have been filling up with passengers.

Indianapolis International Airport officials say the new route with United Airlines was three-quarters sold in January and February, the two slowest months for air travel. Airport executive Chris Matney tells the Indianapolis Business Journal that jumped to 90 percent sold in March with more spring break leisure travelers.

The flights started in early January after the Indiana Economic Development Corp. agreed to provide up to $1.5 million a year in revenue guarantees.

Several central Indiana tech companies sought the year-round nonstop San Francisco flights to make business travel to Silicon Valley easier.

Exact Target CEO Scott Dorsey says the Indianapolis-based company has booked hundreds of flights for employees on the route.

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Photo Credit: United Airlines jet flies from Denver to Los Angeles. InSapphoWeTrust / Flickr