Calculated Take-off Time Slot

The Slot Swapping function helps the identification, assessment and request of eligible flights for ATCFM Slot Swapping.

As it is a semi-automated process (with minimal keyboard input), the risk of errors and typos - and as consequence, of rejection by NMOC- is minimized.

Querying Flights

1. Solved: Hi, I basically have Start time and End time. I need to calculate how many hours belong to specific time slot 06-18, 18-22 and 22-06.
2. CTOT is a tactical slot allocation time calculated to determine the time at which a flight is required to become airborne. Target Time of Arrival (TTA) is a progressively refined planning time that is used to coordinate between arrival and departure management, and to support DCB.

Please refer to the Aircraft Operator section of the Flights chapter for general information on the fields and filters belonging to the Query Area.

Calculated Take-off Time Slots

In a typical Slot Swapping context, here are the steps to follow:

The departure slot - this is the time slot given to flight from the tower. There are many airlines given the same departure slot; and they must start moving within a certain time limit of this slot, otherwise they are pushed back into the scheduling queue. The departure time - this is the time, after which, the airplane cannot be boarded. Calculated Take Off Time (CTOT) - The time provided by the CFMU, taking into account the ECAC ATC flow situation, that an aircraft has been calculated to tak.

1. In the Operator field, enter your own operator code - or, if you have agreements other operators within your group, the list of codes separated with a comma - then specify the WEF and UNT values:

2. When you click on the Go button (or hit the Enter key), all the flights matching the query will be listed in the Results area, and any flights that will be identified as having potential opportunities to be swapped with will have their ARCID and Regulation ID link displayed in green (instead of blue):

Calculated Take-off Time Slot Machine

3. Select such a flight in the list ...

4. ... then click on the now enabled Investigate Swap button to get a pop-up dialog:

This dialog brings up the following options:

• improve slot: look to improve the CTOT of the selected flight by swapping with another flight that has the same (most penalising) regulation,
• delay slot by 30 minutes: look to delay the CTOT up to 30min of the selected flight with any other flight that has the same (most penalising) regulation,
• delay slot bay 60 minutes: as above, but look to delay the CTOT up to 60min,
• show all candidates: show all Slot Swap opportunities.

5. To continue with this example, we will go for the last option, show all candidates:

6. This options returns all candidates that might be able to swap with the selected flight (BAW143 in this example):

Two tables are presented:

• Subject Flights: contains the selected flight you want to work on,
• Candidate Flights: contains the potential candidate flight(s) for slot swapping, and indicating:
  • New Delay - the new delay for both flights (if the swap was actioned),
  • New CTOT - the new Calculated Take Off Time for both flights,
  • New EDLT the new Estimated Landing Time for both flights,
  • Swap decide by - the latest time a swap can be requested to NMOC.

In this example, the current Delay is 19 min. Before you start investigating, the New Delay is indicating 0:

7. You will then cycle through flights in the Candidate Flights list to check and evaluate what impact they will have on the New Delay for the Selected Flight:

Option 1: New Delay of 8 min

Option 2: New Delay of 23 min

Option 3: New Delay of 34 min

Option 4: New Delay of 25 min

8. You then select the best option you can achieve. In this example, we assume that you will want to swap between BAW143 and BAW139.

9. From this point, rather than having to manually enter the request in the E-Helpdesk Portlet and again risk typos, you can click on the Create E-Helpdesk Request button to open the E-Helpdesk application and automatically create a request based on the data transmitted by the Flights Portlet, including whether the flight is a swap between own operator, or different operators (subject to airline's own agreement):

10. Lastly, after having checked the form, simply click on the Submit button to send the request to the NMOC for impact assessment.

11. When done, you will access the E-Helpdesk in the usual way to monitor and track the progress of your flight.

Please refer to the E-Helpdesk section for more information on the request follow-up.