I. INTRODUCTION

II. NTNS INTEGRATION IN 5G ECOSYSTEM

III. NTNS OPERATION IN MMWAVE

IV. NTNS INTEGRATION IN IOT

V. NTNS INTEGRATION IN MEC NETWORKS

VI. ML-EMPOWERED NTNS

VII. HIGHER LAYER ADVANCEMENTS

VIII. NTNS FIELD TRIALS AND INDUSTRIAL EFFORTS

IX. NTNS INTEGRATION IN 6G

X. CONCLUSION