Once the 789 Allegris issues are over one of the 744s reverts back to FRA-YYZ so that means one route elsewhere will get an improvement. It was supposed to happen in March I believe but when the 789 issues were pushed back the 789 stays on YYZ until the new date. Actually it needs to come back. Although AC is preferable if you need different timing with only 4 J seats the LH option has only been selling J and C buckets with a rare D fare sometimes which has led to some crazy connecting through FRA price quotes