<p>LONDON — The threat of terrorism has again disrupted international air travel, forcing British Airways to cancel flights yesterday to Washington and Saudi Arabia. But one top British pilot accused intelligence agents of "jumping at shadows."</p>
<p>British Airways officials said that, acting on a warning from the British government, it had grounded Flight BA223 to Washington scheduled for Sunday, and its Flight BA263 to Riyadh, the capital of Saudi Arabia, on Monday.</p>