Ebookers gives a BA booking number which BA online check in doesn't know [duplicate]

I made a booking through ebookers, using a combined BritishAirways/AmericanAirlines flight (BA for one way, AA for return) about 4 weeks ago. I got booking numbers for both BA and AA from ebookers.

The booking number for AA works on the AA website, and the AA booking shows both legs of the journey, but doesn't allow me to check in on the BA flight.

The problem is, the flight is tomorrow and the booking number for BA seems to be unknown by the BA online system, which is worrying (no, the booking number isn't NOSYNC). The flight is from ZRH to the United States. I do have an approved ESTA.

Is there anything I should do to avoid possible issues, other than showing up at the airport 2 hours before departure? I'm also thinking of US specific issues such as API (AdvancedPassengerInformation) data.

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How do I find my BA booking reference?

Regardless of where you made your reservation, your booking reference can be found on your ticket (in an area called 'PNR code' or 'Locator') or on your e-ticket itinerary receipt. The reference is a series of six characters containing letters and numbers.

Why is BA not doing online check-in?

The error is only due to BA's incapability to handle complex itineraries. So, if you have too many segments on your ticket, you cannot do the online check-in. This may affect those trying to do last-minute seat changes as they are only available at the time of checking in.

Is British Airways doing online check-in?

British Airways - Online Check-in - Welcome. Welcome to British Airways Online Check-in. Online Check-in is available from 24 hours to 1 hour before departure. If you are flying from the United States, you must have completed your Check-in 2 hours before departure.

Can I add BA frequent flyer number after booking?

You go to an airport check-in counter on the day (which you'll need to do anyway if you have bags to drop off). They will confirm what FF numbers are in the booking and add any that need to be added.

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