Wow, well the good news is it can be done.....it just depends when their trip is and how flexible their dates are.

If they are going during "off peak" they can do it on American for 35K each in economy. Off peak dates are: Hawaii: Jan. 12 - Mar. 8; Aug. 22 - Dec. 15

During the peak times it is 45K each round-trip. These quotes are for economy seats. The good news is that a very quick search of AA did show 5 seats available for some off-peak dates.

If both the husband and wife use the "two browser trick" sign up for both the Amex and Visa version of the Citi AA 50,000 mile cards, they will each get 100,000 miles, so their 200,000 combined today will be more than enough if they are traveling during off-peak times (assuming they can get seats). They need to pay attention to their spending abilities to time the card applications appropriately. Depending on their ability to hit the minimum spending requirements for the bonus, this may take a little while.

Hope this helps!