? 
Might be you dont know how good is this 'wheel-chair' trick. We (I mean, me and some of my friends) have used it in past. You will be surprised how good it is for them - it is more reliable than 100% ensured FedEx service ;-).
In fact, your parents will arrive here without having to speak a single word. Everywhere, they will be taken care, from one plane door to another plane. Mention 'non-english speaking, disabled & vegetarian' when booking ticket. In fact, they will feel more comfortable than being with someone helping Nepali. And you can also feel stress free, cuz they will care them even in case of flight miss or any adverse condition. Just your parents should not feel shy to receive 'too much' handling and caring - like using wheel chair ;-) ..
.