Летать - Лететь - ПолетатьTo fly (Regularly or a fact in the past - Randomly, without a goal, Now or a process in the past Towards a goal - future / started to do and haven't finished yet)
Лететь (лечУ, летИшь, летЯт - лете́ли) - Полечу́, полети́шь - полете́ла