The delivery of 98 F-35s is a significant achievement for Lockheed Martin, indicating successful execution of its defense contracts. This news is likely to be viewed positively by investors as it reflects the company's ability to meet production targets and deliver on its commitments. The increase in the global fleet to over 990 aircraft also suggests sustained demand for the F-35, which could lead to future contracts and revenue streams. Therefore, this news could have a positive short-term impact on Lockheed Martin's stock price.