Berkshire Amasses $2.6 Billion Stake in Delta Airlines

Berkshire Hathaway Inc. amassed a $2.6 billion stake in Delta Airlines Inc., reigniting the conglomerate’s complicated relationship with the airline industry.

The Omaha, Nebraska-based company said it had purchased 39.8 million shares in the airline as of the end of March, according to a regulatory filing Friday. The move — which amounted to a 6.1% stake — sent shares of the carrier up more than 3% in late trading.