With the economy in the dumper _ and showing few signs of a revival anytime soon _ a good deal is valued more than ever. So, all hail Leann's Cafe out on the Burlingame bayfront. The diner, open 24 hours a day, seven days a week, is located at 777 Airport Blvd., inside the Red Roof Inn. The food (traditional American dishes and some wonderful Chinese specialties) is tasty, plentiful and fresh. And, what's even better, airline employees receive a 15 percent discount on all menu items. The staff is courteous, attentive and prompt. The atmosphere is casual and friendly. Check it out.