United Continental Holdings Inc. ’s management sent a dramatic safety warning to its pilots last month, calling for stepped-up compliance with rules and procedures following several serious incidents caused by cockpit errors. The bulletin, issued Jan. 9 under the heading “significant safety concerns,” said it was prompted by four separate “safety events and near-misses” in previous weeks, including a plane whose pilots had to execute an emergency pull-up maneuver to avoid crashing into the ground. Another flight cited in the document landed with less than the mandatory minimum fuel reserves.
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