What additional information should be included on the flight progress strip?

Including the record of time of filing and delivery on the flight progress strip is essential for effective air traffic management. It gives controllers critical context regarding when a flight plan was filed and when it was disseminated to other parties. This information helps in tracking the flight’s status, ensuring that appropriate actions can be taken if there are delays or if the flight has not followed the expected procedures.

For instance, knowing when a flight's plan was filed allows controllers to assess whether the plan is still relevant and whether it aligns with expected traffic flows. Similarly, understanding when that information was delivered ensures that controllers can respond timely to any changes that arise during the flight’s progress.

The other options, while they provide useful information, do not hold the same critical importance for immediate air traffic control operations as the time of filing and delivery. Weather conditions inform decisions but are often communicated separately. Estimated time of arrival can change and is also addressed through other means. Route deviations, while significant, are typically managed through direct communication and may not need to be documented on the strip unless they become a trend affecting multiple flights.