Routes: New CDC guidelines, Southwest preclearance, fare rule changes, frequent flyer news, more A weekly roundup of air travel and airport news Jim Glab FacebookTwitterEmail Southwest is adding a new pre-clearance protocol for Bay Area-Hawaii flights.Jim Glab In this week’s roundup, the CDC eases up on its warnings against air travel for fully vaccinated individuals; Southwest Airlines now offers pre-departure verification of Hawaii’s travel requirements; major carriers extend expiration dates for use of travel credits and for basic economy change fee waivers; Delta offers new enticements for SkyMiles members; Alaska and American introduce reciprocal upgrade privileges for elite-level frequent flyers; new study rates the best airline loyalty programs; JetBlue gains access to London Heathrow; and route news from Spirit, American, Emirates and Korean.