UPS is gearing up for Christmas. The package delivery company announced this week that it will hire from 90,000 to 95,000 employees to help handle shipping and deliveries over the holiday season. The company has struggled to handle a crush of online shipping over the past two years, particularly during the last, frenzied days of the shopping season, when retailers entice people into buying last-minute gifts by offering free shipping. Millions of packages arrived late in 2013 and 2014. However, UPS said it is better-prepared this year because it is reaching out to more customers, including smaller retailers, to get estimates of how many orders they expect to receive.