A connectivity issue is forcing Delta agents to check in and board travelers manually. The disruption coincides with a major winter storm snarling travel along the East Coast.

Airlines at Denver International Airport delayed or canceled hundreds of flights on Tuesday as strong, gusty winds swept across Colorado’s Front Range and Eastern Plains.

Millions across the northeastern United States contended with treks to school and work as they dug out from a major storm that blanketed the region with snow, canceled flights, disrupted transit and d