On 12 June, Prime Minister Casares Quiroga met General Juan Yagüe, who falsely convinced Casares of his loyalty to the republic. Mola began serious planning in the spring. Franco was a key player because of his prestige as a former director of the military academy and as the man who suppressed the Asturian miners' strike of 1934. He was respected in the Army of Africa, the Army's toughest troops. He wrote a cryptic letter to Casares on 23 June, suggesting that the military was disloyal, but could be restrained if he were put in charge. Casares did nothing, failing to arrest or buy off Franco. With the help of the British intelligence agents Cecil Bebb and Hugh Pollard, the rebels chartered a Dragon Rapide aircraft (paid for with help from Juan March, the wealthiest man in Spain at the time) to transport Franco from the Canary Islands to Spanish Morocco. The plane flew to the Canaries on 11 July, and Franco arrived in Morocco on 19 July. According to Stanley Payne, Franco was offered this position as Mola's planning for the coup had become increasingly complex and it did not look like it would be as swift as he hoped, instead likely turning into a miniature civil war that would last several weeks. Mola thus had concluded that the troops in Spain were insufficient for the task and that it would be necessary to use elite units from North Africa, something which Franco had always believed would be necessary.