The workers' union Unite is negotiating with BAA, a private company based in Spain that owns seven U.K. airports, over a new pension plan.
The 5,000 security, maintenance and administrative workers were planning to walk out on Jan. 7, Jan. 14 and Jan. 17. But the first strike was called off because BAA agreed to negotiate, Unite told the Associated Press and Bloomberg News.
The union told Bloomberg that the strikes would have shut the airports down, but BAA never confirmed that would happen, the wire service said.
Heathrow is the world's busiest airport, and a shut down would have major implications on all of the world's busiest airports, including Dallas/Fort Worth Airport, the third-busiest on the globe. D/FW Airport won't begin feeding nonstop flights to Heathrow until this spring, but it sends a bunch of connecting traffic there.