Arriving on SQ 52 from MAN at 2:30pm on a Saturday (travelling in business class). The ticket says arriving in terminal E. I'm taking a Westjet flight to YYC which depart at 6:15pm from Terminal A. I'm a Canadian and have Nexus/Global entry. Travelling with carry-on only (no checked-in bag). Not familiar with IAH - looking at the map the terminals are at the opposite ends. I'm assuming I have enough time. What's the best way to get to terminal A from E? Thanks!