The U.S. Transportation Department (DOT) issued tentative allocations for re-assigned U.S.-Havana frequencies to five carriers, providing a major boost for United Airlines’ service from Houston Intercontinental Airport (IAH), with frequencies jumping from once weekly to daily. Other carriers awarded new frequencies included American Airlines, Delta Air Lines, JetBlue Airways and Southwest Airlines. The allocations, which must be implemented within 90 days of the government’s ...