I thought so at first, but then I realized it's a trick question. In fact, the biggest bird in the world is the cave swallow, P. f. pallida, with a wingspan of 4.2"-4.4".
Oilbirds live in caves and I think they are a bit larger
An albatross has half the wingspan and 1/3 the weight of these monsters.
Albatrosses are not even the largest flying birds alive today. The Andean Condor holds that crown.
Wandering Albatross have a wider wingspan than Andean Condors on average if I am not mistaken