By Mike Stone, Gram Slattery and Humeyra Pamuk WASHINGTON/ANKARA, July 8 (Reuters) - President Donald Trump said on Wednesday he was leaving Turkey aboard an older Air Force One aircraft rather than a recently renovated Qatari-donated jet, an unexpected switch that renewed scrutiny of the costly, fast-tracked retrofit. The trip to Turkey, the first international travel for the new plane, took place as hostilities escalated with Iran, a country that borders Turkey.