Spirit Airlines said  it has reimbursed  most customers with flight tickets after the budget carrier ceased operations .  The airline is still processing a "small percentage" of customer refunds, Spirit told CBS News.  Spirit  announced early Saturday  that it had "started an orderly wind-down of operations" after efforts to obtain a $500 million federal bailout failed. The airline pledged to automatically process refunds for any flight purchased with a credit or debit card.  Who is eligible