The Rebbe was a fan of El Al:
See letter of the Rebbe‘s secretariat published in The Letter and the Spirit page 244:
―As a matter of fact, far from discouraging Jews from traveling via El Al, the Rebbe
favors this line as evidenced by the fact that this year too, the Lubavitcher Chasidim
coming to visit the Rebbe from Kfar Chabad made their round trip via El Al. See
also the Rebbe‘s letter to Rabbi Shlomo Yosef Zevin dated 23rd Tamuz 5716, Igrot kodesh vol. 13 page 293
מובן שנסיעתם נסתדרה שבכל מקום האפשרי יסעו דוקא באל על וכדרז"ל עה"פ קנה מיד עמיתך.