And today word of the day is: Efficiency Tags:aircraftaviationenglishdcefficiencyelearningICAOICAO4Uicao4youicaoenglishicaoexamicaolevel4icaolevel5icaolevel6pilotsamolotwordoftheday Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name * Email * Website Comment * Save my name, email, and website in this browser for the next time I comment.