It looks like OEE, OEF, OEG and OEH have all undergone heavy checks in the last 18 months so would imagine these 4 ER's are safe.
Whilst OJT, OEI, OJS, OEJ, OJU and OEB (in that order, with OEB being the most recent) have all undergone C checks.
As Fred C has posted other factors are taken into consideration but my money is on OEI and OJT as the next for withdrawal as neither of these 2 have had an extended hangar visit since 2016, that said it all depends of whether OEI is put through another D check as it can't be too far off.
I believe the B744's on QF3/4 to HNL have been bought forward to August also.
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