Https://collaboratory.gse.upenn.edu/sites/default/files/webform/official-lufthansa%C2%AE-airlines-customer-service%C2%AE-contact-numbers-in-the-usa%C2%AE-full-detailed-guide.pdf https://collaboratory.gse.upenn.edu/sites/default/files/webform/official-lufthansa%C2%AE-airlines-customer-service%C2%AE-contact-numbers-in-the-usa%C2%AE-full-detailed-guide.pdf https://collaboratory.gse.upe... https://collaboratory.gse.upenn.edu/sites/default/files/webform/official-lufthansa%C2%AE-airlines-customer-service%C2%AE-contact-numbers-in-the-usa%C2%AE-full-detailed-guide.pdf