MINNEAPOLIS, Minnesota (AP) -- A computer glitch caused more delays for some Northwest Airlines Corp. flights Wednesday, as the carrier attempted to fly a full schedule while its technicians worked to fix the problem that delayed nearly 300 flights on Tuesday.

While no flights were canceled Wednesday, about 80 Northwest flights had been delayed an average of 20 minutes by midmorning.

Northwest Spokesman Kurt Ebenhoch said Wednesday the airline's information technology department was continuing to make progress on restoring the airline's computer system. In the meantime, backup systems were being used.

Of Northwest's 1,364 scheduled flights Tuesday, about 285 departures were delayed an average of 21 minutes as result of the computer problem, he said. He said Detroit was the most seriously affected of its three U.S. hubs. Minneapolis-St. Paul and Memphis, Tennessee, experienced fewer delays. The departure delays included international flights.

Pinnacle and Mesaba were also expected to operate full schedules on Wednesday, Ebenhoch said, after having a few flights canceled on Tuesday.

Northwest said it would not accommodate unaccompanied minors or pets connecting through its Detroit, Minneapolis/St. Paul or Memphis hubs on Wednesday flights, nor would it accommodate unaccompanied minors on flights originating in Detroit.

The problem began Tuesday afternoon and was centered in a computer system that enables communication between the Worldspan global distribution system and some Northwest airport computer systems, Northwest said.

The system began gradually returning to normal about 45 minutes later but was still operating at limited capacity late Tuesday, Ebenhoch said.

Northwest was encouraging customers to check in and obtain their boarding passes over the Internet and check their flight status online.

The airline issued a waiver allowing customers to change their travel plans without penalty. Customers with confirmed tickets for travel scheduled Tuesday and Wednesday may reschedule their travel to begin on or before August 1 without penalty or administrative fees.

Alaska museum reflects drama of landscape

FAIRBANKS, Alaska (AP) -- The museum on the hill looks like breaching whales. Or maybe the swooping white walls bring to mind shimmering northern lights. Or ships passing. Or the Earth's great tectonic plates shoved up and over one another.

Riding the rails to Lhasa: China opens train to Tibet

ABOARD THE BEIJING-LHASA EXPRESS (AP) -- Chugging past shaggy yaks and fluffy clouds that look low enough to lasso, the train from Beijing to Lhasa makes its final climb into nosebleed territory pulled by three locomotives instead of the usual one.

Computer glitch causes problems for Northwest

MINNEAPOLIS, Minnesota (AP) -- Northwest Airlines Corp. said a computer problem that developed Tuesday afternoon resulted in delays and cancellations of some Northwest and Northwest Airlink flights.

Get the most out of your African safari

(Budget Travel Online) -- It's a big trip in terms of time, planning, and money -- so before heading into the lion's den, conduct a bit of research.

The laughter of children carries Rwanda's hope

KIBUYE, Rwanda (CNN) -- Vast Lake Kivu sparkles, with its waves and lush islands. It conjures up visions of a tropical paradise, perhaps somewhere in the South Pacific.