اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ
Allahu Akbar, Allahu Akbar, Allahu Akbar
Allah is the Greatest, Allah is the Greatest, Allah is the Greatest. (Said when ascending a hill or taking off.)
Jabir (RA) said: "When we ascended, we would say Allahu Akbar, and when we descended, we would say SubhanAllah." The logic is beautiful: ascending brings you closer to the sky, so you declare Allah's greatness; descending reminds you of His perfection, so you glorify Him.
Related Du'as
اللَّهُمَّ اغْفِرْ لِي ذُنُوبِي وَافْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
O Allah, forgive my sins and open for me the doors of Your mercy.
Hasanسُبْحَانَ الَّذِي سَخَّرَ لَنَا هَٰذَا وَمَا كُنَّا لَهُ مُقْرِنِينَ وَإِنَّا إِلَىٰ رَبِّنَا لَمُنقَلِبُونَ
Glory to the One who has subjected this for us, and we could never have it by our own efforts. And indeed, to our Lord we will surely return.
Sahihآيِبُونَ تَائِبُونَ عَابِدُونَ لِرَبِّنَا حَامِدُونَ
We return repentant, worshipping, and praising our Lord.
Sahihاللَّهُمَّ إِنَّا نَسْأَلُكَ فِي سَفَرِنَا هَذَا الْبِرَّ وَالتَّقْوَى وَمِنَ الْعَمَلِ مَا تَرْضَى
O Allah, we ask You in this journey of ours for righteousness and piety, and for deeds that are pleasing to You.
Sahih