Create README.md

README.md

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+# 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
+
+---
+
+# 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. |
+
+---
+
+# 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.     |
+
+---
+
+# 3. Carriers Table
+
+| Column         | Description            |
+| -------------- | ---------------------- |
+| `iata_code`    | Airline code.          |
+| `carrier_name` | Official airline name. |
+
+---
+
+# 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.           |
+
+---
+
+# 5. FuelPrice Table
+
+| Column           | Description            |
+| ---------------- | ---------------------- |
+| `date`           | Date of record.        |
+| `jet_fuel_price` | Jet fuel price in USD. |
+
+---
+
+# 6. FuelIndex Table
+
+| Column           | Description                  |
+| ---------------- | ---------------------------- |
+| `date`           | Date of index.               |
+| `jet_fuel_index` | Normalized fuel index value. |
+
+---
+
+# 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).          |
+
+---
+