I booked a ticket from ORD to LAX via IAH. I checked with ITN. On March 5, CO 1101 ORD to IAH has 0 F if I choose the connection CO 1667 from IAH to LAX. But if I choose connection CO 1009, there will be 8 F available on CO 1101. Why the same flight CO 1101 show different F seats available? Can someone help me to answer the question?