Today's post on tacking free oneways onto your roundtrip Delta awards generated a lot of interest, but I need to clarify a few things that spawned some confusion. If you haven't read that post, though, do so first. It's right below this post.

1. The distance between the open jaw cities needs to be less than than the distance of a oneway between your home airport and the roundtrip award's destination. Let me explain with examples.

The open jaw cities when you're adding a free oneway are the very first city in your itinerary and the very last.

After my popular posts about booking free oneways on United and American, this installment will focus on tacking free oneways onto Delta awards. This article presumes a knowledge of how to book free stopovers on Delta.com, which I covered here.

If you'll recall from those posts, we need two things to book any free oneway: a stopover and an open jaw. Luckily on its awards, Delta offers both a stopover and an open jaw.

JetBlue, my favorite coach cabin in the world, and Southwest are both having one day sales that end today, May 15, at 11:59 PM ET.

First the JetBlue sale: Here's a complete list of the city pairs with fares on sale. If you want to fly one of those routes between May 22 and June 21, the deals are generally pretty good. Click on a city pair for black out dates and day-of-the-week restrictions.

This is the another post in my Anatomy of an Award series, in which I take a real award I've booked and break it down step-by-step to elucidate the award booking process.

The winner of the free $67 AA Gift Card is my twitter follower @GlennLader.

If you want to be bored by how I picked the winner, I numbered the comments on the post 1-43, and my twitter followers 44-153.

A few days ago, I talked about how to book free stopovers online on United and American awards. This post is about booking free stopovers on Delta. Just as the other posts were preludes to booking free oneways online, tomorrow I will describe how to book free oneways on Delta awards. It will involve booking free stopovers online, so read this post carefully.

Delta is the only airline that allows free stopovers on domestic flights, so I'll show an example of that.

Thanks to reader Mulbry, who found some roundtrips to Hawaii incorporating stopovers. I hope everyone is thinking what I thought. Where there are stopovers and open jaws, free oneways can be constructed.

I immediately set about about to find free oneways the same I described on Friday.

And I confirmed my hunch.

#1 Ralph writes in to ask whether he should cancel his previously booked United award to take advantage of a 2,500 mile oneway to Hawaii:

Just wanted to say what an awesome post on United Award flights and the ability to add flights from the East Coast to HNL for only 2,500 miles! I personally think that is one of the best examples you've highlighted.

I wish I saw this about two weeks ago when I booked a JFK-LIS, stopover, LIS-MAD, openjaw, BCN-JFK award flight.

If you're new to MileValue, welcome! You should click the Start Here tab on the top of the page; it tells you the best place to start depending on your skill level. Check back daily because in the next few days I'll be revealing how to get free oneways on US Airways and Delta awards!

Occasionally I give away something awesome like a gift card or lounge passes; it's another reason to check MileValue daily. On to the giveaway:

I’m giving away a $67 virtual American Airlines gift card.

Miles collectors are used to adding free oneways to American awards, but may not have learned about tacking a free oneway onto a United award until yesterday. Because of the newness, there is some confusion that I want to clear up by comparing the two types of free oneways. But if you haven't read either of those linked posts, please do so now. For this post, I'll use my normal notation to indicate a stopover (//). Here are the differences between the two:

1.