README.md

Airline Delay Analysis Database

airline_delay_analysis.db is a SQLite database that integrates airline operation data, airport metadata, weather conditions, fuel prices, and stock performance to support comprehensive analysis of flight delays in the United States.

It contains the following tables:

1. Airline – core flight-level data
2. Airports – airport metadata
3. Carriers – airline company information
4. Weather – daily weather per city
5. FuelPrice – daily jet fuel price
6. FuelIndex – normalized fuel price index
7. StockPrice – airline-related stock data

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1. Airline Table

Primary table containing one row per scheduled or operated flight.

Location and Identification Columns

Column	Description
airline_id	Internal unique row ID.
FL_DATE	Flight date.
OP_UNIQUE_CARRIER	Airline carrier code (e.g., AA, DL).
OP_CARRIER_FL_NUM	Flight number assigned by the carrier.
ORIGIN_AIRPORT_ID	Numeric ID for origin airport.
ORIGIN	Origin airport IATA code.
ORIGIN_CITY_NAME	Origin city name.
ORIGIN_STATE_ABR	State abbreviation.
ORIGIN_STATE_FIPS	FIPS state code.
ORIGIN_STATE_NM	Full state name.
ORIGIN_WAC	World Area Code for origin.
DEST_AIRPORT_ID	Destination airport ID.
DEST	Destination airport IATA code.
DEST_CITY_NAME	Destination city name.
DEST_STATE_ABR	Destination state abbreviation.
DEST_STATE_FIPS	Destination state FIPS code.
DEST_STATE_NM	Destination state name.
DEST_WAC	World Area Code for destination.
CRS_DEP_TIME	Scheduled departure time (HHMM).
DEP_TIME	Actual departure time (HHMM).
DEP_DELAY	Actual departure delay in minutes.
DEP_DELAY_NEW	Departure delay with negative values clipped to zero.
DEP_DEL15	1 if departure delay is 15 minutes or more.
DEP_DELAY_GROUP	Delay group category (15-minute bins).
DEP_TIME_BLK	Scheduled departure time block (e.g., "0600-0659").
CRS_ARR_TIME	Scheduled arrival time.
ARR_TIME	Actual arrival time.
ARR_DELAY	Actual arrival delay in minutes.
ARR_DEL15	1 if arrival delay is 15 minutes or more.
ARR_DELAY_GROUP	Arrival delay group category.
ARR_TIME_BLK	Scheduled arrival time block.
CANCELLED	1 if the flight was canceled.
CANCELLATION_CODE	Reason code (A=Carrier, B=Weather, C=NAS, D=Security).
DIVERTED	1 if the flight diverted to another airport.
CRS_ELAPSED_TIME	Scheduled elapsed time in minutes.
ACTUAL_ELAPSED_TIME	Actual elapsed time in minutes.
AIR_TIME	Time spent in the air.
FLIGHTS	Number of flights (usually 1).
DISTANCE	Flight distance in miles.
DISTANCE_GROUP	Distance category (50-mile bins).
CARRIER_DELAY	Delay caused by airline operations.
WEATHER_DELAY	Delay caused by weather conditions.
NAS_DELAY	Delay caused by the National Airspace System.
SECURITY_DELAY	Delay caused by security issues.
LATE_AIRCRAFT_DELAY	Delay caused by previous aircraft arriving late.
DEP_DELAY_OVER15	1 if departure delay ≥ 15 minutes.
ARR_DELAY_OVER15	1 if arrival delay ≥ 15 minutes.
TOTAL_DELAY	Combined total delay.
ANY_DELAY	1 if any delay condition is present.

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2. Airports Table

Column	Description
airport_id	Unique airport ID.
airport_code	Airport IATA code.
city_name	City of the airport.
state_abbr	State abbreviation.
state_name	Full state name.

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3. Carriers Table

Column	Description
iata_code	Airline code.
carrier_name	Official airline name.

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4. Weather Table

Column	Description
date	Date of weather record.
t2m	Temperature at 2 meters (Kelvin).
v10	Wind speed at 10 meters.
snc	Snow cover percentage.
sde	Snow depth equivalent.
city_name	City name.
state_abbr	State abbreviation.
state_name	Full state name.
lat	Latitude.
lng	Longitude.
t2m_C	Temperature in Celsius.

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5. FuelPrice Table

Column	Description
date	Date of record.
jet_fuel_price	Jet fuel price in USD.

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6. FuelIndex Table

Column	Description
date	Date of index.
jet_fuel_index	Normalized fuel index value.

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7. StockPrice Table

Column	Description
stock_price_id	Unique row ID.
date	Trading date.
price	Closing price.
open_price	Opening price.
high_price	Highest trading price.
low_price	Lowest trading price.
volume	Number of shares traded.
change_percentage	Percentage change from previous close.
company_name	Company or ETF name.
iata_code	Airline code (if applicable).

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