The company expects, however, that only a third of those customers will seek refunds.
Over all, about 70 percent of all returns seek refunds, which last year averaged $1,066.
Customers who think they were overcharged can seek refunds from stores or apply to state officials.
He said the book in question was of value and that any unsatisfied customers who sought refunds received them.
The policy has been in effect for a week, and Delta said 100 to 200 passengers had sought refunds.
He did say, however, that tax payments were running higher and the number of returns seeking refunds was lower than had been anticipated.
On their return home, they might be seeking refunds.
After four months the airline announced a procedure for people seeking refunds.
That means developers can seek refunds of the estimated $30 million already collected by towns.
He also voiced doubts that many people would seek refunds from their unions - something they are allowed to do.