MIAMI — Boarding a domestic flight now carries genuine legal risk for immigrants in the country's largest Latino hubs, as U.S. Immigration and Customs Enforcement leans on traveler information the Transportation Security Administration collects to detain people at check-in counters, boarding gates and arrival concourses alike. Cases documented across California, Texas and Florida in recent weeks involve travelers holding pending asylum claims, valid work permits or no criminal record at all — a pattern immigration attorneys say has turned ordinary trips into legal minefields for entire communities.