New Delhi, July 17 -- WASHINGTON - The most popular bipartisan legislation in years is about to test whether it can survive the operational objections of one of Washington's most effective lobbying industries.

Airlines for America, the trade group representing the country's major carriers, warned this week that making daylight saving time permanent - a change that passed the House 308-117 and now awaits Senate action - would take up to two years to safely implement, disrupting schedules, stranding passengers in connection gaps, and requiring costly overhauls of airline reservation systems, crew scheduling software, payroll platforms, and maintenance logs.

"Airlines operate expansive interconnected domestic and global networks that are r...