BETA’s A250 aircraft takes flight at company headquarters in Vermont. Photo courtesy of BETA TechnologiesTheo Wells-Spackman is a Report for America corps member who reports for VTDigger.org.BETA Technologies filed for an initial public offering on Monday morning, after reports of the move circulated last week. The South Burlington-based company plans to list its stock on the New York Stock Exchange “as soon as practicable” under the symbol “BETA,” accord