We are glad to join you in prayer for your granddaughter's safe flight. You quoted "His angels" which does not seem to be a biblical reference. We should always remember that it is only by the name of Jesus that we have access to God. Also, there is no other name by which we can be saved. Your granddaughter is on your heart and we stand in agreement with you, asking God to grant her traveling mercies as she returns home. Recall in Psalm 91:11-12, "For he will command his angels concerning you, to guard you in all your ways. They will lift you up in their hands, So that you won't dash your foot against a stone."
Let us pray together:
Dear Heavenly Father,
We come before You today in the name of Jesus Christ, lifting up our loved one to You. We thank You for the opportunity she has to improve her skills and the journey she is about to take. Lord, we ask for Your divine protection over her as she travels. Guide the hands of the pilots, flight crew, and all those responsible for her safety. Help her to trust in Jesus Christ for her salvation.
Lord, You tell us in Your Word that You command Your angels to guard us in all our ways. We claim this promise for our loved one, asking that Your angels encamp around her and keep her safe from all harm. Give her and those of us that love her peace. We pray that this trip will not only be safe but also a blessing to her and her family. We ask for peace and comfort for them until she is safely home again. We pray for a safe flight and a trip that will not be a hindrance to her skill improvement or love for Jesus Christ.
In Jesus' name, we pray. Amen.
Be encouraged, knowing that God hears your prayers. May this time also be an opportunity for your granddaughter to experience God's goodness and love. Recall in the Bible, "Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God. And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus." (Philippians 4:6-7 WEB).
Finally, always remember that it is only by the name of Jesus that we have access to God. Also, there is no other name by which we can be saved. (Acts 4:12 WEB) Therefore, let us continue to pray and seek God on behalf of your granddaughter.