Here are some back of the envelope facts, gathered off of Irving's own website re the AOPS
1) 3 Sept, 2015 first steel cut on the first AOPS
1.1) 10 June, 2016 first 2 of the 4 main engines installed (9 months duration)
1.2) Dec, 2017 final mega block assembled (27 months duration)
1.3) Sept ??, 2018 first AOPS is launched (36 months duration)
Start to launch - 3yrs duration
2) 26 Aug, 2016 first steel cut on the second AOPS
2.1) April, 2018 first 2 of the 4 main engines installed (timeline under the 1st AOPS was 9 months - here its 20 months)
2.2) Final mega block assembled ?? - using the timeline established under the 1st AOPS, 27 months, this should occur in Nov of 2018.....
2.3) ?? second AOPS is launched - using the timeline established under the 1st AOPS, this should occur in Aug of 2019
Start to launch - ??
3) Dec 2017, first steel cut on the third AOPS
3.1) ?? first 2 of the 4 main engines installed - again, using the timeline under the first AOPS, this should occur in Sept 2018 OR if using the timeline under the 2nd AOPS, July, 2019....)
3.2) Final mega block assembled ?? - using the timeline established under the 1st AOPS, this should occur March 2020
3.3) ?? third AOPS is launched - again using the timeline under the 1st AOPS, this should occur in Dec 2020.
Start to launch - ??
Yes - I fully agree/accept that this is a crude methodology to be using, but its all that is readily available. Using the information that is on Irving's own website one can conclude that timeline established on the 1st AOPS has already slipped on the 2nd AOPS and its too early to tell if its slipping on the 3rd AOPS but I'm willing to bet that it is.
So, are the timelines slipping because Irving is having a hard time getting up to speed (surely the final mega block being wider than the rest of the ship by what, 40mm can't be helping), or are they slowing down the delivery times in order to 'close' any 'gap' between when they finish that last (will it be 5 or 6 AOPS?) ship and start the first CSC in the mid 2020's?