Obamas to evacuate Martha's Vineyard... on separate planes (again)

The Obamas took his & hers jets to get to their summer vacation destination at Martha's Vineyard, costing the taxpayers thousands of dollars.

Now, with Hurricane Irene bearing down on the East Coast, President Obama plans to cut his vacation short and leave Friday evening for Washington. Mrs. Obama, however, will take her own flight out on Saturday with their two daughters, Malia & Sasha.

Is there a reason why -- yet again -- the Obamas could not share a flight on the world's most exclusive private jet and instead needed separate travel arrangements?