Yeah, the BOS-LHR fare comes out to $283. Good deal for over 7000 status miles, but slightly misleading.

Note:
SURCHGS

SECURITY SURCHG OF USD 248.76 APPLIES PER ADT/CHD/INF IN EACH DIRECTION. APPLIES TO TRANSATLANTIC INTL SECTOR.

Hmm?

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When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return.

- Leonardo da Vinci