As Deutsche Post DHL prepares for its annual shareholder meeting in Germany this week, American pilots who fly worldwide for the logistics company announced the results of a recent vote to authorize their union to call a strike if necessary. Pilot support across all five of DHL’s North American network carriers – Atlas, Southern, Polar, ABX and Kalitta – is nearly unanimous. In total, 93 percent of the five-company pilot groups participated in the strike vote and 99 percent of those pilots voted in favor of a strike.

A strike could cripple DHL’s global operation as the five carriers account for approximately 70 percent of DHL’s total flying worldwide. A pilot strike could also have a significant impact on In March ATSG – which owns ABX – announced an agreement with the e-retailer to operate an air cargo network serving Amazon customers in the United States. Meanwhile, just signed an agreement with Atlas Air to double its fleet for domestic packages.

Nearly 2,000 pilots at the five U.S. cargo carriers voted online through anonymous balloting in April and May. Pilots at Atlas, Southern, Polar, and ABX first called for the strike vote in March as concerns grew out of lingering contract negotiations with their individual carriers. Kalitta pilots authorized a strike in December 2015. The pilots are represented by the International Brotherhood of Teamsters and its airline affiliate, Teamsters Local 1224.