Deutsche Lufthansa AG shares dropped 5.3 percent Friday after the surprise departure of Chief Financial Officer Simone Menne opened an unwelcome hole in the German airline’s top management at a time when its strategy is in a state of flux.

Lufthansa will seek to fill the CFO role “shortly” after granting Menne’s request to prematurely terminate her contract as of Aug. 31, the company said in a statement late Thursday. The executive, who turns 56 in October, is leaving to “pursue individual career options.” She said last year that she eventually wanted to head a company in Germany’s benchmark DAX30 stock index.

“There was no indication that this might happen,” said Gerald Khoo, a London-based analyst at Liberium Capital Ltd. “She is well-regarded by investors. They will want to know why this happened, and why it happened now. It’s unusual given Lufthansa’s history of succession planning.”

Her departure comes at a sensitive time for Lufthansa. Conflicts with labor unions over cost-cutting efforts remain unresolved, and the rampup of the Eurowings low-cost arm has been sluggish. The projects are critical to fend off discounters Ryanair Holdings Plc and EasyJet Plc on regional services amid increasing competition for lucrative long-haul flights from the likes of Emirates.

Investment Grade

Menne, a member of the carrier’s management board since 2012, has helped Chief Executive Officer Carsten Spohr steer the company through restructuring including cutting benefits and pay for entry-level workers. Menne also helped safeguard Lufthansa’s investment grade rating, a rare honor for an airline, even with the company’s pension liabilities surpassing 10 billion euros ($11.3 billion) last year.

The lack of a successor is unsettling for investors, since it took the company five months to appoint Spohr after his predecessor Christoph Franz left in the midst of heavy restructuring two years ago. Lufthansa shares fell to as much as 63 cents to 11.37 euros, the lowest intraday price since September 2015, and were down 5 percent at 11.41 euros as of 12:12 p.m. in Frankfurt.

Her departure leaves the future uncertain for one of the few woman executives in corporate Germany. She was the sole female CFO among the DAX companies. Only Henkel AG has a woman, Simone Bagel-Trah, chairing its supervisory board. None of the country’s 30 biggest listed companies are headed by a woman.

Lufthansa is reining in expansion plans as a glut of plane seats depresses ticket prices and travelers delay bookings amid fears of terror attacks. Capacity growth this year will trail the previous target of 6 percent, Spohr said in an interview last month. The cuts will come on short- and long-haul routes at Lufthansa’s namesake brand while Eurowings will continue to grow, he said.

‘Proven Worth’

As low oil prices boosted profit to record levels at Lufthansa and other airlines and spurred expansion, summer capacity plans failed to take into account the impact of terror attacks in Paris, Brussels and Turkey.

A graduate in business administration, Menne began her professional career in the auditing department of ITT in the U.S. in 1987 before joining Lufthansa as an auditor in April 1989. Ten years later she took over the airline’s financial management and human resources in southwest Europe, rising to the same position for all of Europe two years after that. Outside Lufthansa, Menne is a member of the supervisory boards of BMW AG and Deutsche Post AG.

“In Simone Menne we are losing an experienced executive who has proven her worth time and again in her long Lufthansa career,” Supervisory Board Chairman Wolfgang Mayrhuber said in the statement.

To contact the reporter on this story: Richard Weiss in Frankfurt at rweiss5@bloomberg.net. To contact the editors responsible for this story: Neil Callanan at ncallanan@bloomberg.net, Chris Reiter at creiter2@bloomberg.net, Christopher Jasper

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Photo Credit: A Lufthansa Eurowings Bombardier CRJ900 [D-ACNV] in Turin, departing to Düsseldorf Airport June 26, 2013. Paulo Cerutti / Flickr.com