Question: In the Hanafi Madhhab, is it permissible to combine two salats during travel?
In the Hanafi Madhhab, it is, in no way, permissible to combine two salats during travel. If there is a need or an extreme necessity to combine two salats during travel, a Hanafi should make use of the rule of any of the other three madhhabs. It is haram to combine two salats if there is no hardship during travel.
Question: In order not to miss a fard salat, is it permissible to combine two salats when traveling by bus?
Yes, it is permissible.
Question: Is it permissible for a Hanafi who is a safari to combine two salats by making use of the rule of the Shafi'i Madhhab or Maliki Madhhab?
There must be necessity so that a Hanafi may, during travel, combine two salats in the time of the former or latter by making use of the rule of the Shafi'i or Maliki Madhhab.
A Hanafi cannot combine two salats in the time of the former or the latter if there is no necessity on the way or in the place he/she is staying because collecting easy rules of the madhhabs is called talfiq, which is not permissible.
If a person traveling by plane is unable to perform salats standing, he/she can perform them by combining when the train stops.
Question: I, during the return journey, delayed performing Salat az-Zuhr in order to offer it in the time for Salat al-Asr by making use of the rule of the Shafi'i or Maliki Madhhab. When the time for Salat al-Asr started, I arrived home and became a muqim. Did I incur a sin because of missing Salat az-Zuhr?
Hadrat Ibn Hajar al-Makki states:
"If a traveling [safari] person postpones Salat az-Zuhr in order to perform it together with Salat al-Asr but becomes a muqim [settled] after the time for Salat az-Zuhr is over before he performs it, he/she must make up Salat az-Zuhr first. He/she does not become sinful for having postponed Salat az-Zuhr until its time is over. It is haram to miss a fard salat without a valid excuse, but one is not sinful in this case because one missed it with the excuse of being on a journey" (Fatawa-i Fiqhiyya).