Earlier this year, a real estate development group announced plans to build what will be the country’s tallest skyscraper in an unlikely location. But the project is now facing delays and warnings about its potential risks to air travel.

Matteson Capital partnered with architecture firm AO on a project that would place a more than 1,900-foot tower in Oklahoma City, far away from the towering peaks associated with the skylines of New York City, Los Angeles and Chicago. Work on the development was tentatively scheduled to begin in October but now it’s pushed back to 2025.