Alaska Air reports April traffic up 4.3%, load factor of 86.8% Alaska also reported 90.1 percent of its flights arrived on-time in April, compared to the 86.8 percent reported in April 2013. Horizon reported April traffic and capacity that was similar with April 2013, and the resulting load factor was consistent at 78.3%. Horizon also reported 93.3% of its flights arrived on-time in April, compared to the 89.3% reported in April 2013. On a combined basis, Air Group reported a 4.9 percent increase in traffic on a 4.9% increase in capacity compared to April 2013. This resulted in a flat load factor of 86.1%.