Delay Propagation Manual
Contents |
Overview
Delay propagation is a process in which a delay at a flight stage causes a ripple effect in the subsequent stages of a flight. Delays propagate into and out of an airport. Arrival delays are tracked at the end of each flight leg traveled by the same aircraft identified by a tail number.
Three conditions must be met in order to compute delay propagation:
- A flight arrives late at an airport.
- It departs late in subsequent stages.
- It arrives late at the next destination.
The Delay Propagation system has two views: City Pair and Propagation Impacts.
For a complete overview of this system, see Delay Propagation.
My Reports
My Reports displays a list of reports you saved after running your query. You may save a report after you enter your search criteria and select the 'Run' button. Then you may name your report and save it for future use. Reports can be created in all Delay Propagation system views. Selecting the information button will display a window listing the selection criteria used for the report. Selecting the deletion button will delete the report.
Saved Reports
This section lists reports that you have saved after clicking the 'Run' button. By clicking on the report name, you will be able to modify or update the saved report with new criteria. Just click on any of the desired tabs to change dates, airports, departures, arrivals, last arrivals, carriers, equipment, output, filters, and grouping options. For more information about saving reports, see the Run section.
Dates
For your Delay Propagation report, you may select specific time periods to query.
The following options are available:
- Days: Allows user to input individual dates through navigation of the calendar.
- Months: Allows the selection of month and year range (from... to).
- Years: Allows the selection of year range (from... to) and calendar and fiscal years.
- Date Range: Allows user to input individual dates without the use of the navigation calendar.
- Period: Allows selection by predefined periods:
- Yesterday
- Current Month by Day
- Last Month by Day
- Calendar Year by Month
- Fiscal Year by Month
- Last 12 Months
Please verify that your selection is for a time period in which data are available.
Selected options will appear on the right.
Departure
The Departure section is specific to the City Pair view and describes the last reported departure location (e.g. location may be a fix or a landing facility).
When the default 'Quick Entry Mode' checkbox is selected, you can select Departure Airports by entering the airport code (or several codes separated by a space) to search for matching airports. By deselecting the 'Quick Entry Mode' option, you will be able to enter airport ID, name, or partial name of the airport to search for a list of matches. The autocomplete feature will suggest possible names of airports in a drop down menu. You may also select pre-defined groups such as ASPM 77, OPSNET 45, or OEP 35 to enter a set of airports. To include all airports, do not select any.
Arrival
The Arrival section is specific to the City Pair view and describes the first reported arrival destination (e.g. destination may be a fix or a landing facility).
When the default 'Quick Entry Mode' checkbox is selected, you can select First Arrival Airports by entering the airport code (or several codes separated by a space) to search for matching airports. By deselecting the 'Quick Entry Mode' option, you will be able to enter airport ID, name, or partial name of the airport to search for a list of matches. The autocomplete feature will suggest possible names of airports in a drop down menu. You may also select pre-defined groups such as ASPM 77, OPSNET 45, or OEP 35 to enter a set of airports. To include all airports, do not select any.
Last Arrival
The Last Arrival section is specific to the City Pair view and describes the last reported arrival destination (e.g. destination may be a fix or a landing facility).
When the default 'Quick Entry Mode' checkbox is selected, you can select Last Arrival Airports by entering the airport code (or several codes separated by a space) to search for matching airports. By deselecting the 'Quick Entry Mode' option, you will be able to enter airport ID, name, or partial name of the airport to search for a list of matches. The autocomplete feature will suggest possible names of airports in a drop down menu. You may also select pre-defined groups such as ASPM 77, OPSNET 45, or OEP 35 to enter a set of airports. To include all airports, do not select any.
Facility
The Facility section is specific to the Propagation Impacts view and describes the arrival impacts airports.
When the default 'Quick Entry Mode' checkbox is selected, you can select facilities by entering the facility code (or several codes separated by a space) to search for a matching facility. By deselecting the 'Quick Entry Mode' option, you will be able to enter facility ID, name, or partial name of the facility to search for a list of matches. The autocomplete feature will suggest possible names of facilities in a drop down menu. You may also select pre-defined groups such as ASPM 77, OPSNET 45, or OEP 35 to enter a set of airports. To include all facilities, do not select any.
Carriers
In both City Pair and Propagation Impacts, you may select specific airline carriers for your report.
When the default 'Quick Entry Mode' checkbox is selected, you can enter full name or full code of the carrier to search for matches. By deselecting the 'Quick Entry Mode' option, you will be able to enter full or partial name or code of carrier to search for a list of matches. The autocomplete feature will suggest possible names of carriers in a drop down menu. To include all carriers, do not select any.
Equipment
In both City Pair and Propagation Impacts, you may select specific aircraft for your report. The types of aircraft are provided by the Flight Plan.
When the default 'Quick Entry Mode' checkbox is selected, you can enter full code or full model of the aircraft to search for matching aircraft. By deselecting the 'Quick Entry Mode' option, you will be able to enter full or partial code or model of aircraft to search for a list of matches that includes aircraft variants. The autocomplete feature will suggest possible names of aircraft in a drop down menu. To include all aircraft, do not select any.
Output
The Output section allows you to choose how to display the file format for your report. Formats available are HTML, MS Excel, and MS Word. Display options vary according to the system view.
Display
You may select different reports based on the two views of the Delay Propagation system.
Format
- HTML: The data requested are presented in a Web browser format.
- MS Excel
- MS Word
- Show Definitions: Where applicable, shows definitions of the fields.
For a list of available definition, see Definitions of Variables.
Filters
Filters are only available in the City Pair view and vary according to the selected report.
Summary Report
Queries can be filtered by minimum and maximum arrival delay and minimum and maximum multiplier.
Base and Statistical Reports
The query outputs can be grouped by date, departure, arrival, and/or last arrival airport, and/or carrier. Six filters are available:
- Arrival Delay of Initial Flight in Series
- Arrival Delay of Last Flight in Series
- Ratio of Last over First Arrival Delay
- Count of Stages in Propagation Chain
- Airport Chain
- Tail Number
Grouping
In City Pair, you may group data by the following fields:
- Departure Airport
- Arrival Airport
- Last Arrival Airport (field not available for summary reports)
- Date
- Carrier
- Equipment
Select the 'Plus' button to choose the groupings for the report. Selected fields will appear on the right. Selected fields can be removed by selecting the 'Minus' button next to each selected field.
Run
Selecting the Run option will run the query and create a report. In Delay Propagation, you may save the search criteria you used to create the report by entering a name for the report and clicking the 'Save' button. From then on, the report name will appear in the 'My Reports' section.
Definitions of Variables
For more information about these topics, please see the Definitions of Variables for the Delay Propagation system.
