Delawareonline.com 3:47 p.m. EST February 13, 2016 Love is in the air this Valentine’s Day. And so is the sound of cash registers. Business owners say a fluke of the calendar has helped to boost sales of cards, gifts and flowers this year, while extending the holiday bonanza for hotels and restaurants. “Valentine’s Day falls on a Sunday this year so that means people are celebrating all weekend,” said Scott Kammerer, president of the coastal hospitality group SoDel Concepts.