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Just when you thought there were no more air-fare bargains left to be found online.

Customers cruising United Airlines' website for tickets on Thursday got a pleasant surprise.

As reported by Forbes. air fares between cities such as Washington, DC and Minneapolis were being sold on the site for $0 to $10.

2012: Best time to buy airline tickets

2012: Best time to buy airline tickets 01:10

The $0 fare and other wildly reduced fares appear to have been available for about 15 minutes, before United shut down its online reservations system, reporting that its site was undergoing maintenance.

"One of our filings today contained an error which resulted in certain fares being displayed as zero. We have corrected this error, " said United in a statement that also blamed human error for the mistake.

The site has since resumed normal operations.

The tickets are sold, now what?

The question now: will United honor the erroneously priced tickets?

Sales of airline tickets based on erroneous fares are nothing new.

In 2012, as reported by hackmytrip.com. Singapore Airlines. United Airlines and Travelocity all wrangled with the problem.

Some believe companies should stand by their sales and accept the consequences of their own mistakes.

Others say airlines shouldn't be held accountable for honest mistakes.

United has yet to issue a statement regarding its plans on whether or not to honor the tickets sold at mistaken fares.

Should United Airlines honor the tickets i t sold Thursday for $0, $5 and $10? Leave a comment below.