This dataset contains the following folders/files:

A) Creation of network structures
 
For each of the five cargo carriers FedEx (FDX), UPS (UPS), DHL (DHL), Cathay Pacific Cargo (CPA), 
and Cargolux (CLX) a specific folder (Note: the five folders might appear as .zip files) is provided that contains:
- a folder named carrier_Network (where carrier is replaced with the name of the specific carrier under scrutiny), that contains 
all retrieved observations of flights for each OD airport pair and each retieval date. Note that each observation refers to a 
14-day time-span culminating in the day reported in the file name, and hence contains the cumulative set of flights
from airport O to airport D in the prior 2 weeks. As example, file MEM_CDG_February_15_2020_FDX refers ro FedEx (as it ends with FDX)
and reports all flights from Memphis International airport (MEM) to Charles de Gaulle airport (CDG) in the time period
February 1st-February 15th, 2020.
- a Pyhton file named carrier_Network.py, which processes all the observations in the aforementioned folder, creates
the graph representing the carrier's cargo network, and computes complex network theory indices and metrics. In addition,
several plots are provided

B) Effect of Covid-19 on network capacities
The two additional Python files are provided:

- compute_geographical_flows_pre_post_covid19.py: for integrators FedEx, UPS, and DHL maximum capacity matrices between some
major airports are plotted for each observation date. Having a dataset that spans from November 2019 to April 2020, the effect
of COVID-19 on capacity is highlighted by comparing the same elements of different matrices

- compute_capacity_variation_perWeek.py: for all five carriers, time-series representing bi-weekly estimated maximum
capacities along major connections are computed. Again, please note that each value represents a cumulative value for the two weeks that culminate on
the day where the marker is positioned. To better contextualize the efefct of COVID-19, five relevant dates are reported with vertical
red lines: 1) December 31st, 2019 - Chinese Health officials inform the World Health Organization about a cluster of 41 patients with a mysterious 
pneumonia (that will be officially called COVID-19 two months later). Most are connected to Huanan Seafood Wholesale Market, 
2) January 11th, 2020 - The first death caused by COVID-19 is recorded in China, 3) January 31st, 2020 - United States President 
Donald Trump bans foreign nationals from entering the United States if they were in China within the prior two weeks, 
4) March 11th, 2020 - United States President Donald Trump bans all travel from 26 european countries, 
and 5) March 13th, 2020 - A United States national emergency is declared over the COVID-19 outbreak.