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Just get them in your arms. The whole reinfection picture is really blurry at the moment because it hasn't been long enough to have good data. I think for the sake of the small chance that you might be feeling a bit groggy on the flight, I'd just have the booster if I was n your shoes.
One thing we do know is that Delta immunity isn't that effective against Omicron, and Delta is still about. A friend of mine caught Omicron only 5 weeks after having Delta. Unlikely to be your situation but still worth considering.
We had covid from the 16th to the 25th of December. Booster is booked for the 15th of Jan (our last doses were July). We're going to Australia from the 18th of Jan to the 9th of Feb.
We're four weeks from first symptoms, so think booster is ok. Is there any downside to getting it before we go? Feeling like shit on the plane? Can we delay until Feb relying on natural immunity from the infection in December?