This lat­est Adobe Dig­i­tal Index report, which looked at 51.5 bil­lion vis­its, reveals over­all trends that illus­trate the move­ment toward book­ing travel online and pro­vides insight into the sea­son­al­ity of online reservations. Based on an analy­sis of more than 150 mobile and global travel (air­line, hotel, travel agency, car rental, cruise line and casino) web­sites from Jan­u­ary of 2009 to April of 2013, online book­ings to these travel sites typ­i­cally peak in mid-July with the U.S.- based com­pa­nies expected to hit $54 bil­lion in Q3, a 10.7% increase over last year. Q4, which typ­i­cally sees a decline in book­ings, is expected to also main­tain an 8–10% YoY growth rate. The Q4 fall-off comes from the hotel and car rental seg­ments; how­ever, air­line book­ings peak in Octo­ber as road war­riors return home and hol­i­day plans are booked far­ther in advance. Increasing demand and the continued shift from offline to online travel bookings continue to drive a surprising amount of new opportunity since the current shift represents a fraction of $600 billion industry. Additionally, new online business models and an improved economy may shift transaction volume toward direct channels in the coming years. Get the full story at Quartz