Question:

“Those who travel regularly like taxi drivers and pilots etc. Are they allowed to break their fast in Ramadhan?”

Al-‘Allâmah Sâlih al-Fawzân:

“Yes, the traveller can break his fast whether his journey is unexpected or frequent. In fact, the frequent traveller is more in need of the allowance than the one who is travelling suddenly. Allah جلا وعلا‏ says: “[…] and whoever is ill or on a journey, the same number (should be made up) from other days.” [Al-Baqarah 2:185]. He generalised travel, whether it is regular or sudden. He makes up when he is resident.

Source: http://www.alfawzan.af.org.sa/node/14851