--(BUSINESS WIRE)--PROS Holdings, Inc. (NYSE: PRO):     WHAT: Group reservations typically require multiple layers of approval, creating customer booking delays of up to a week or more.   Airlines are looking for new ways increase group revenue and bookings, provide a seamless and efficient booking experience for travelers and travel agents, and make real-time dynamic pricing for groups as easy as making individual travel arrangements.   This informative webinar will offer insights and real-wor