Ummm, I'm not convinced, as this article says nothing about wealth, just income.
I'm not convinced the numbers mean inequality is lower, either. The wealthy may have less on paper than before the crash, but they have the same stock. So presumably when the stock market does recover, they'll have as much as they did. They have less capital, but more potential.
"Income" for the majority of citizens means "wages." Which are a pain in the ass to shelter. "Income" for the wealthiest of citizens means "capital appreciation." Which are trivial to shelter. This study basically says "wages for the 90% have risen faster over the past four years than the pathetically small amount of capital gains declared by the wealthy on their taxes." Which is not surprising. The ability to show a loss on your taxes provides you with all sorts of accounting flexibility. Hey, it might even get the NYT to write a piece sympathizing with your plight.
And if you can get 15-20 of your friends to go along, the price comes down to what you pay a domestic carrier. Had a gig where a client basically bullied me into chartering a jet to get a hard drive from Seattle to Dallas to be there by 7am the next day. Fortunately for all concerned, none of the charter companies were interested in playing... but I did learn that the "meter drop" on a charter jet is about $5500.