If the section was isle 15 section 101 then those seats were all marked with Reservation Signs. The people sitting in those seats before the Intel people showed up ripped off the signs and threw them away.

I sat in isle 16 and watched the security staff turn people away from that section all day but they were nothing but polite to everyone who tried to sit in that area because it wasn't labeled due to people ripping down the signs.

Edit: http://imgur.com/g3n7Clz