It will be interesting to see what AI decide to do if this YYZ link goes ahead.
A number of options are available,but as you say,ATNotts,reliability is an issue.It has improved in the last year or so,but then again the B787s are still fairly new,so the aircraft themselves may not be the problem.
Also the 777s that were used previously are no longer in the fleet.They were second hand,leased but used by United before AI.All sorts of issues were had with them.
We await further news.
azz767 the only 737 I am aware of is 9H-OME. Air Charter X.It is chartered by the MOD for the Wednesday service to Paderborn.