In this week’s roundup, a new study of federal statistics determines the nation’s most (and least) reliable airlines in a year marked by flight disruptions; Oakland is expected to have a new option for travel to El Salvador in the spring; low-cost Zipair begins flights from San Jose to Tokyo on Monday; Air Canada adds a long route from Sacramento next summer; there’s international route news from Qantas, Delta, American and Spirit Airlines; low-cost Breeze Airways adds five new routes…