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bukhari:1090 – ʿAbdullāh b. Muḥammad > Sufyān > al-Zuhrī > ʿUrwah > ʿĀʾishah

"When the prayers were first enjoined they were of two rakʿat each. Later the prayer in a journey was kept as it was but the prayers for non-travelers were completed." Az-Zuhri said, "I asked ʿUrwa what made Aisha pray the full prayers (in journey)." He replied, "She did the same as ʿUthman did."  

البخاري:١٠٩٠ – حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ قَالَ حَدَّثَنَا سُفْيَانُ عَنِ الزُّهْرِيِّ عَنْ عُرْوَةَ عَنْ عَائِشَةَ ؓ

قَالَتِ الصَّلاَةُ أَوَّلُ مَا فُرِضَتْ رَكْعَتَيْنِ فَأُقِرَّتْ صَلاَةُ السَّفَرِ وَأُتِمَّتْ صَلاَةُ الْحَضَرِ قَالَ الزُّهْرِيُّ فَقُلْتُ لِعُرْوَةَ مَا بَالُ عَائِشَةَ تُتِمُّ قَالَ تَأَوَّلَتْ مَا تَأَوَّلَ عُثْمَانُ  

See similar narrations below:

Collected by Muslim, Nasāʾī, Dārimī
muslim:685c – ʿAlī b. Khashram > Ibn ʿUyaynah > al-Zuhrī > ʿUrwah > ʿĀʾishah

The prayer was prescribed as consisting of two rak'ahs, the prayer in travelling remained the same, but the prayer at the place of residence was completed. (Zuhri said he asked 'Urwa why 'A'isha said prayer in the complete form during journey, and he replied that she interpreted the matter herself as 'Uthman did.)  

مسلم:٦٨٥c – وَحَدَّثَنِي عَلِيُّ بْنُ خَشْرَمٍ أَخْبَرَنَا ابْنُ عُيَيْنَةَ عَنِ الزُّهْرِيِّ عَنْ عُرْوَةَ عَنْ عَائِشَةَ

أَنَّ الصَّلاَةَ أَوَّلَ مَا فُرِضَتْ رَكْعَتَيْنِ فَأُقِرَّتْ صَلاَةُ السَّفَرِ وَأُتِمَّتْ صَلاَةُ الْحَضَرِ قَالَ الزُّهْرِيُّ فَقُلْتُ لِعُرْوَةَ مَا بَالُ عَائِشَةَ تُتِمُّ فِي السَّفَرِ قَالَ إِنَّهَا تَأَوَّلَتْ كَمَا تَأَوَّلَ عُثْمَانُ  

nasai:453 – Isḥāq b. Ibrāhīm > Sufyān > al-Zuhrī > ʿUrwah > ʿĀʾishah

"The first time the Salah was enjoined it was two Rak'ahs, and it remained as such when traveling, but the Salah while resident was made complete."  

النسائي:٤٥٣ – أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ قَالَ أَنْبَأَنَا سُفْيَانُ عَنِ الزُّهْرِيِّ عَنْ عُرْوَةَ عَنْ عَائِشَةَ قَالَتْ

أَوَّلَ مَا فُرِضَتِ الصَّلاَةُ رَكْعَتَيْنِ فَأُقِرَّتْ صَلاَةُ السَّفَرِ وَأُتِمَّتْ صَلاَةُ الْحَضَرِ  

darimi:1550 – Muḥammad b. Yūsuf > Sufyān b. ʿUyaynah > al-Zuhrī > ʿUrwah b. al-Zubayr > ʿĀʾishah

[Machine] "The prayer was initially ordained with two units (rak'ahs). Then the prayer of travel (safar) was established with a shortened form, while the prayer of residence (hadar) was performed in its complete form." So I asked, "What was the reason for completing the prayer during travel?" He (Uthman) said, "It was interpreted (or understood) in this way as Uthman had also interpreted it."  

الدارمي:١٥٥٠ – حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ قَالَ سَمِعْتُ الزُّهْرِيَّ يَذْكُرُ عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ عَنْ عَائِشَةَ قَالَتْ

«إِنَّ الصَّلَاةَ أَوَّلَ مَا فُرِضَتْ رَكْعَتَيْنِ فَأُقِرَّتْ صَلَاةُ السَّفَرِ وَأُتِمَّتْ صَلَاةُ الْحَضَرِ» فَقُلْتُ مَا لَهَا كَانَتْ تُتِمُّ الصَّلَاةَ فِي السَّفَرِ؟ قَالَ إِنَّهَا تَأَوَّلَتْ كَمَا تَأَوَّلَ عُثْمَانُ