The second winter storm in five days takes aim at the Midwest again today.

Airlines pre-emptively canceled more than 345 flights at Chicago O'Hare and 180 in Kansas City by Tuesday morning. More than 600 flights were canceled nationwide on Monday, according to FlightStats.

Airports in Lubbock and Amarillo, Texas, were expected to reopen later today after shutting down operations on Monday.

The two back-to-back storms have caused more than 1,900 flight cancellations in the past three days.

Most airlines have issued flexible rebooking policies for passengers with flights to, from or through the airports in the storm's path.

Follow Gay Nagle Myers on Twitter @gnmtravelweekly.

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