"only sell earlybird for the A boarding position.
There is no way to do that because there is no way to know how many A-Listers will grab A spots until 36 hours before the flight. You could have A50-A60 available and then 10 A Listers buy tickets and grab them.
EBCI only guarantees 2 things:
1) you don't need to worry about checking in at t-24 hours
2) You will get a better boarding position than everyone that checks in manually.
That's it.
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