Michelle Obama's $500K Plane Ride To Africa

The Obama women made the $500K trip to Africa this summer and even more interesting than the monumental amount of money the taxpayers footed for this latest trip is that the Obama girls were listed as senior staff.
The documents made public by Judicial Watch do not include the total of all costs for the First Lady's trip, such as expenses for security, transportation on the ground and so forth
Judicial Watch had to sue to get this information - could it be that the Obamas are ashamed of the wasted taxpayer money or just pissed about that whole Freedom of Information Act?