Is it permissible to complete a program for a company as part of a graduation project, knowing that this program contributes to improving commercial websites, including those of airlines and non-Islamic banks?

It must be noted that the internet is used for both good and evil, and it is not permissible to assist in its use for disobedience, as Allah Almighty says: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression." As for airlines and non-Islamic banks, they perform permissible acts such as safeguarding money and transporting travelers, but in return, they offer forbidden things like alcohol and deal with usury. The internet is not a tool for sin in itself; therefore, there is no harm in completing the graduation project software unless it is known or thought that it will be an aid to sin.